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        <h1>Physics Department Talks</h1>
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		{ title: "Quantum Vortices of Propagating Photons", date: "2026-06-05", time: "11:00 AM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Ofer Firstenberg, Weizmann Institute of Science, ISRAEL ", abstract: "Strong effective interactions between photons can be generated in a medium of ultracold Rydberg atoms, in the so-called quantum nonlinear optics regime. These interactions enable deterministic entanglement between photons and allow light to exhibit matter-like many-body dynamics. We find that strong optical nonlinearities can also lead to the formation of quantum vortices. In our experiments, we observe phase singularities, including vortex rings, in the spatial few-photon wavefunction. More recently, we have directly generated and observed freely propagating quantum vortices of light.", pdf: "abstract1.pdf" },



        	{ title: "Wrapping and encapsulation of microgels at membranes", date: "2026-06-01", time: "04:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Tanwi Debnath, Theoretical Physics of Living Matter, Institute for Advanced Simulation, Forschungszentrum Jülich, 52425Julich, Germany.  ", abstract: "The softness of polymer gels plays a key role in their interaction with biological cells. Microgels with tunable size, shape, and deformability are a versatile system for understanding the interaction of elastic particles with lipid-bilayer membranes. 1 Using a spring network model for the microgels and triangulated surfaces for the membranes, we study microgel-membrane systems using computer simulations and energy minimization. We determine the interplay of microgel and membrane deformations controlled by the competition between microgel elasticity and membrane bending rigidity. Our results predict an increased stability of partial-wrapped states for microgels with lower Young’s moduli. 2 There is a discontinuous transition from oblate to nearly spherical microgels with increasing wrapping fractions. Understanding wrapping at lipid-bilayers can guide the design of the polymeric gels with optimal elasticproperties for biomedical applications, such as targeted drug delivery vectors. We also encapsulate microgels with various Young’s moduli within a spherical vesicle and shrink the gels at different rate. We observe a single bud for slow and a wrinkled membrane for high shrinking rates, similar to the osmotic compression of shells. 3, 4 Vesicle-encapsulated microgels are promising drug delivery vectors because of their versatile surface functionalization possibilities. This study will allow us to comprehend blebbing of cells, which is common in the process of cell motility and death..", pdf: "abstract1.pdf" },


		{ title: "Collective Ordering and Mechanical Response in Dense Active-Passive Mixtures", date: "2026-05-11", time: "04:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Amir Shee, Postdoctoral Research Associate, Department of Physics, University of Vermont. ", abstract: "Dense active-passive mixtures are emerging as a powerful framework for describing heterogeneous systems ranging from bacteria in biofilms and invasive cancer cells to synthetic robotic collectives. These systems exhibit rich phenomenology, including orderdisorder transition and fluid-solid transition driven by the interplay between activity and passive dissenter. In my talk, I will first discuss order-disorder transitions in dense two-dimensional mixtures of passive and active self-aligning particles with isotropic or anisotropic mobility. I will then present results on robust active energy control of the fluid-glass transition in threedimensional active-passive mixtures. I will conclude by introducing motility allocation as a powerful yet minimal design principle for tuning collective motion and mechanical rigidity in active soft materials, and discuss its implications for engineering reconfigurable, bio-inspired metamaterials.", pdf: "abstract1.pdf" },



		{ title: "A new TMD factorization relating large-x and small-x", date: "2026-04-15", time: "03:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Shaswat S Tiwari, Brookhaven National Lab, New York, USA", abstract: "QCD factorization takes on different forms in the large-x and the small-x regimes. In the large-x motivated collinear factorization, one gets the DGLAP evolution equation, whereas, in the small-x motivated rapidity factorization, the BFKL equation is the major player. To unify different regimes, a new TMD factorization based on the background field method is proposed, which not only reduces to CSS and DGLAP in the large-x limit and BFKL in the small-x limit, but also defines a general evolution equation away from these regimes. We compute NLO corrections to Gluon and Quark TMDs in the dilute regime. Such a factorization has the potential to significantly advance our comprehension of high-energy processes and the three-dimensional structure of hadrons. As an application for a process we shall also discuss leading order results for dijet production in the background field method.", pdf: "abstract1.pdf" },


		{ title: "Quantum Design(QD) Applications ", date: "2026-04-08", time: "10:30 AM - 3:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Randy Dumas, Applications Scientist, Quantum Design USA", abstract: "The seminar will feature application talks, a hands-on lab session covering measurement techniques and best practices. This seminar will be highly beneficial for users working on magnetic, transport, and advanced materials characterization.", pdf: "abstract1.pdf" },

		{ title: "Monopoles, Generalised Symmetries, and Dualities ", date: "2026-04-07", time: "03:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Madhusudhan Raman, visiting faculty, Ashoka University", abstract: "It is natural to consider extending Maxwell's electrodynamics to include point-like sources of magnetic fields, i.e. magnetic monopoles. I will begin by discussing some classic results on monopoles and their interactions. I will then discuss electric-magnetic duality, the role of generalised symmetries, and efforts to develop theories of charges and monopoles interacting with light, all building up to a discussion of recent work on a novel, manifestly Lorentz-invariant, and straightforwardly quantisable action for duality-symmetric gauge theories. I will conclude with a brief review of the various attractive features of our proposal and the consistency checks it passes, as well as indicate directions for ongoing and future work.", pdf: "abstract1.pdf" },

		{ title: "Ultrafast Ablation for Novel 2-D Materials, Composites, and Applications", date: "2026-04-20", time: "03:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Soma Venugopal Rao, Senior Professor, School of Physics & DIA-CoE (ACRHEM), University of Hyderabad, India", abstract: "Ultrashort pulsed lasers are now regularly used in the ablation/surface processing/nanofabrication of various materials such as (i) metals (e.g., Ag, Au, Cu, Ag-Au, Au-Cu, Ag-Au-Cu) (ii) semiconductors (e.g., Si, Ge, GaAs, SiC, InP), 2-D materials (e.g., TMDCs, MXenes, few-layer graphene),etc.  We have utilized the technique of ultrafast laser ablation (in air/liquids) for producing diverse nanoparticles/nanostructures of the above-mentioned materials along with functionalized/hybrid nanomaterials (e.g., Ag-Au/Si, Ag-Au/Ge, Ag-WS2, etc.) [1-24]. We could achieve surface nanostructures and achieve wide-ranging nanocolloids using these short pulses by varying the focusing conditions (using shaped pulses such as Gaussian, Bessel, Vortex, etc.), surrounding liquid, input pulse duration, input pulse energies, and the number of incident pulses on the surface. We will discuss the fabrication of novel 2D materials and composites along with the physics of these processes. We will discuss the potential applications of these versatile nanomaterials in photonics, optoelectronics, etc.", pdf: "abstract1.pdf" },


		{ title: "Active and Nonreciprocal Nanophotonics", date: "2026-04-08", time: "04:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Aditya Tripathi, Australian National University in Canberra, Australia", abstract: "Active and nonreciprocal photonic devices revolutionized electronics, optics and communications over the past decades finding numerous applications in logic, multiplexing and computing. Such photonic devices however remain considerably bulky and costly, particularly when comparing to their electronic counterparts, such as semiconductor diodes and transistors that have been miniaturized to the nanoscale. Size and cost of active and nonreciprocal photonic devices represents a roadblock for further advancements of our light-based technologies. In this research we develop and apply the principles of light manipulation at the nanoscale to various optically active media to radically miniaturize such devices. We leverage nanophotonics engineering of sharp resonances, perfect reflection and transmission, dichroism and topological phases. We judiciously choose material platforms to add desired light matter interactions like optical gain and generation of light, optical nonlinearity and phase transitions. We engineer the dielectric nanostructures to achieve the desired light-matter interactions in the active media. We develop two types of devices based on their functionality: light generation and nonreciprocal traffic control of light. This work paves the new way in the field of active nanophotonics and introduces a new branch of research in nonreciprocal nanophotonics.", pdf: "abstract1.pdf" },

		{ title: "Unveiling the Origin of the Slow Solar Wind: Multi-Instrument Observational Insights into Pseudostreamer Dynamics", date: "2026-03-25", time: "12:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Arpit Shrivastav, a postdoctoral fellow at Southwest Research Institute (SwRI), Boulder, United States,", abstract: "The solar wind speed exhibits a well-known bimodal distribution, consisting of a fast component (typically> 500 km s−1) and a slow component (< 450 km s−1). Decades of near-Earth in-situ observations have shown that the fast wind is relatively homogeneous in its plasma and magnetic properties. In contrast, the slow wind displays substantial variability in speed, magnetic field, and elemental composition, suggesting contributions from multiple and possibly different source regions in the corona. Large-scale coronal structures, streamers and pseudostreamers, are one of the major sources of the slow solar wind. However, the physical mechanisms that release plasma from these structures into the heliosphere remain poorly understood. This study investigates the dynamics of a pseudostreamer to identify the processes that release plasma from the low and middle corona. We explore the nature of flow dynamics at the coronal base and near the cusp region of the structure. Furthermore, we investigate abundances near the pseudostreamer boundary to understand sources of slow or fast solar wind. We used Solar Orbiter's Full Sun Imager (FSI), High Resolution Imager (HRIEUV), and Spectral Imaging of the Coronal Environment (SPICE) to analyze the pseudostreamer from inner to middle corona. Our analysis revealed quasi-periodic propagating disturbances (PDs) near the pseudostreamer boundary with an average period of 11 minutes. Spectroscopic analysis shows persistent blueshifts and coronal plasma composition at the base and near the boundary of the pseudostreamer. Furthermore, FSI captures signatures of downflows near the pseudostreamer cusp and boundary resulting from interactions between open and closed structures. PDs originating near the base travel along the pseudostreamer boundaries and can be a source of solar wind within these large-scale structures. Downflows observed near the cusp are consistent with the interchange reconnection process. Together, these results highlight the complex dynamics within pseudostreamers and demonstrate how processes in the inner and middle corona facilitate solar wind transport into the outer corona.", pdf: "abstract1.pdf" },

		{ title: "Non-Abelian gauge theory dynamics with tensor networks", date: "2026-03-18", time: "03:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Ms. Navya Gupta, Maryland University", abstract: "Gauge theories underpin our understanding of fundamental interactions, yet simulating their real-time dynamics is challenging. Tensor-network methods have been widely applied to gauge theories to study their dynamics. In this work, we bring a new tool to the problem: the Loop-String-Hadron (LSH) formulation, which recasts gauge fields into local, gauge-invariant building blocks. We develop a tensor network toolkit for the SU(2) gauge theory in 1+1-D using the LSH formulation. Using this toolkit, we reproduce existing results and push dynamics calculations to larger lattices and higher flux-cutoff values. This allows us to access richer features in the dynamics of string breaking in the presence of dynamical matter. A key strength of the LSH approach is its generality: it has been developed for SU(3) and for higher spatial dimensions, providing a systematic path toward full QCD simulations. While we focus on classical tensor-network studies, this framework also offers a natural bridge to quantum simulation, serving as a benchmark for near-term devices, and potentially informing the design of future algorithms. This work demonstrates the practical applicability of the LSH formulation for advancing both classical and quantum studies of gauge theories, and for moving closer to realistic simulations of QCD.", pdf: "abstract1.pdf" },

		{ title: "Dissipation statistics in turbulence: From paths to patterns", date: "2026-03-16", time: "14:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Mr. Ritwik Mukherjee, PhD student at ICTS, Bangalore", abstract: "Energy dissipation lies at the core of statistical theories of turbulence. In fully developed turbulence, dissipation is neither uniform nor smooth, but instead concentrates in rare, intense events that dominate small-scale dynamics. Large deviation principle provides a natural framework to understand dissipation statistics in fully developed turbulence. In this talk, we will explore the dissipation statistics from Eulerian and Lagrangian viewpoint. By using ideas of multiplicative cascade, we show, dissipation intermittency exhibits fundamentally distinct statistical behaviors in Eulerian and Lagrangian descriptions. While Lagrangian intermittency is well described by a large deviation principle and a scale-invariant multiplicative cascade, the Eulerian dissipation field cannot be cast within this standard framework. Finally, we will discuss how to connect these two statistical descriptions using a modified bridge relation.", pdf: "abstract1.pdf" },

		{ title: "Annealing Amorphous Solids using Oscillatory Shear and Active Dopants and Memory Formation", date: "2026-04-01", time: "04:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Smarajit Karmakar, Tata Institute of Fundamental Research Hyderabad", abstract: "Understanding the mechanical properties of amorphous solids has been a field of intense research not only for the zoo of interesting phenomena one observes once these solids are subjected to external deformations but also for their importance in industrial applications. Amorphous solids fail catastrophically via shear band formation, and tuning their mechanical yielding is important for designing better materials. I will focus on the annealing mechanisms in these solids as they are of practical importance. I will highlight the utilization of self-motility as another means to anneal glasses and use that as a means to fine-tune the failure mode of the system under uniaxial tensile deformation. I will demonstrate the annealing effects of activity and draw parallels with other well-known mechanical annealing processes, such as oscillatory shearing (both uni- and multi-directional). We investigate motility-driven annealing and fluidization in these systems and establish a correspondence between the yielding behavior of glassy systems under active dynamics and their yielding under oscillatory shear. The yielded region of the phase diagram correlates with tissue fluidization, while the annealing region explains age-related maturation and stiffening. This suggests that some mechanical changes observed in ageing tissues can partially stem from processes analogous to enhanced ageing observed in active glasses. In addition to showing similar yielding diagrams, we strengthen the correspondence to oscillatory shear by demonstrating diverging time scales to steady states, the possibility of memory encoding and reading, and the importance of stress reversals in the annealing process in both cases. Finally, we study yielding in active solids and demonstrate that given the correct geometry, one can either suppress or promote brittle failure via shear band formation by tuning activity. Finally, I will touch upon the memory effects in cyclically deformed amorphous solids through computer simulations. Applying oscillatory shear deformations in all orthogonal directions during encoding creates robust memories that are agnostic to the reading direction. Our extensive system size analysis shows that memory encoding is faster in small systems and becomes exceedingly challenging as systems approach the thermodynamic limit. Using tension-compression cycles on amorphous nanorods, we show that, indeed, memory encoding and reading are possible in the presence of free surfaces as well.", pdf: "abstract1.pdf" },

		{ title: "Engineering the viscous flow of charge and heat in ultra-clean graphene layers", date: "2026-03-11", time: "14:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Aniket Majumdar, IISc, Bangalore", abstract: "Over the past decade, electron fluids in graphene have attracted significant attention due to their unique electrical properties [1, 2]. Interestingly, near the charge neutrality point of its band structure, graphene is expected to behave like a 'Dirac fluid' - a fluid of massless Dirac fermions described by a universal electrical conductivity  [3]. Despite recent experimental reports of fluid-like electronic transport, disorder remains the major obstacle to realising this viscous electron motion in graphene. In this talk, I will introduce 'ultra-clean graphene' – a wide rectangular channel of hBN-encapsulated ultraclean graphene devices with exceptionally low electronic disorder (~ 10^9 cm^-2), supported by numerical simulations and electrical, optical and mechanical characterisations [4]. Next, I will describe a series of electrical and thermal transport measurements which reveal strong signatures of electron hydrodynamics in our devices. This includes a giant violation of the Wiedemann-Franz Law near the charge neutrality point across a range of temperatures and a saturation of the η/s ratio for our devices near room temperature, within a factor of four of the holographic bound  [5]. Our experimental observations are also quantitatively consistent with expectations for a non-Galilean-invariant Dirac fluid. Finally, I will conclude with a novel opto-electronic probe to reversibly tune disorder in graphene, which, in turn, allows one to explore the disorder-to-hydrodynamic crossover in ultra-clean graphene [6]. [1] L. Levitov et al., Nat. Phys. 12, 672 (2016). [2] A. Lucas et al., J. Phys. Condens. Matter 30 053001 (2018). [3] M. Muller et al., Phys. Rev. Lett. 103, 025301 (2009). [4] R. Madhogaria et al., arXiv:2602.16847 (2025). [5] A. Majumdar et al., Nat. Phys. 21, 1374-1379 (2025). [6] A. Gugnani et al., Phys. Rev. Lett. 135, 256501 (2025).", pdf: "abstract1.pdf" },

           { title: "Physics in Germany: Navigating the Path to Research and Industry", date: "2026-02-20", time: "11:00 AM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Kirill Bolotin, Department of Physics, Freie University of Berlin & Excellence Cluster for Chiral Electronics", abstract: "From the foundations of quantum mechanics to modern breakthroughs in the quantum Hall effect and spintronics, Germany remains a global powerhouse in physics. Yet, for many international students, the prospect of moving here is clouded by concerns about language barriers, complex bureaucracy, and immigration hurdles. In this talk, Prof. Kirill Bolotin offers an insider’s perspective on the reality of pursuing research and higher studies in Germany. Furthermore, he will talk about his research on nanomechanical probing, manipulation, and control of excitons in 2D materials. In particular, his group demonstrated an approach to induce controlled tensorial mechanical strain in two-dimensional (2D) materials and heterostructures at cryogenic temperatures, a technique that can be used to investigate many-body behaviors of excitons.", pdf: "abstract1.pdf" },

        { title: "Direct Collapse Black Holes with Decaying Dark Matter", date: "2026-02-18", time: "02:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Yash Aggarwal, University of California (UC), Riverside", abstract: "Direct Collapse Black Holes (DCBHs)—formed via the collapse of massive gas clouds in pristine, first star-forming halos—are a promising pathway to explain the existence of supermassive black holes observed at high redshifts in the Universe. The DCBH model critically depends on the suppression of molecular H2 as a coolant, and the capacity of gas clouds to cool via atomic H transitions in first galaxies. Traditionally, this benchmark requires irradiating a target halo by intense Lyman-Werner (LW) radiation that dissociates molecular H2. Recent developments show that when time dependent effects of halo mergers and accretion are taken into account, the effective LW flux required for massive seed formation is substantially reduced. In this talk, I will review these developments and show that axion dark matter decaying in the intergalactic medium can naturally realize the necessary conditions for DCBH formation, providing a diffuse and persistent source of H2 suppression without invoking extreme radiation environments.", pdf: "abstract1.pdf" },


		{ title: "Principles of Chromatin Folding and Condensation: An Active-Polymer Modelling Approach", date: "2026-02-20", time: "04:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. P B Sunil Kumar, Department of Physics IIT Madras", abstract: "Chromatin organisation is inherently dynamic and tightly coupled to gene regulation. Within the nucleus, condensed heterochromatin is typically transcriptionally repressed, whereas more open euchromatin is associated with activity. ATP-dependent chromatin remodelers reshape this landscape by promoting loop formation and by sliding, evicting, and rebinding nucleosomes. Although these processes clearly influence genome architecture, their respective contributions to spatial folding and temporal dynamics remain unresolved. In this talk I will present an active-polymer modelling framework for chromatin that explicitly incorporates remodeler-driven activity. We use it to disentangle how loop-mediated compaction and nucleosome-level remodelling set condensation levels and dynamical regimes. The resulting static and dynamic structures are consistent with key experimental observations, offering mechanistic insight into how active processes coordinate chromatin folding across scales.", pdf: "abstract1.pdf" },

		{ title: "Understanding the Solar Chromosphere’s Fine Structure: Bridging Simulations and Observations", date: "2026-02-16", time: "03:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Sanghita Chandra (PhD, Max Planck Institute for Solar System Research (MPS))", abstract: "Spicules are thin, jet-like structures in the Sun’s lower atmosphere that may contribute to coronal heating. They are frequently associated with emission from hotter atmospheric layers, but their interpretation is complicated by line-of-sight superposition, Doppler-dependent visibility, and the need to infer three-dimensional structure from two-dimensional observations. Realistic 3D simulations now provide a means to address these challenges. We present the first statistical analysis of synthetic spicules from MURaM-ChE simulations, which capture key aspects of chromospheric dynamics. A non-equilibrium treatment of hydrogen enables direct examination of spicule geometry in 3D. Using a novel Hα proxy, we identify numerous spicules both above the limb and on the disk in a simulated enhanced-network region. We further examine the response of spicules in higher-temperature plasma using synthetic Si IV emission. By combining physically motivated synthetic diagnostics with 3D simulations, this work provides a self-consistent framework for interpreting spicule morphology and apparent dynamics, helping to bridge the gap between chromospheric observations and models.", pdf: "abstract1.pdf" },

		{ title: "Many-body chaos in classical many-body systems", date: "2026-02-13", time: "04:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Subhro Bhattacharjee, International Center for Theoretical Sciences, TIFR, Bengaluru ", abstract: "Molecular chaos is central to understanding behaviour of many-body systems. In such systems the spatiotemporal chaos has two aspects -- the temporal growth and the spatial spread that are characterised respectively by the lyapunov exponent and butterfly velocity. In this talk, I shall present the behaviour of these timescales and length scales associated with chaos in equilibrated classical many-body systems both with and without quasiparticle description and discuss questions related to -- (1) onset of chaos, and (2) connection between chaos and diffusion of conserved quantities.", pdf: "abstract1.pdf" },
        
		{ title: "Integrated Quantum Photonics", date: "2026-02-11", time: "03:00 PM", venue: "II LT-1 (near scoops)", speaker: "Prof. K Thyagarajan, Former Professor of Physics at the Indian Institute of Technology, Delhi (IITD)", abstract: "Photons are playing a significant role in quantum science and technology with applications in quantum computing, quantum key distribution, quantum teleportation and many other areas. Integrated quantum photonics (IQP) deals with integration of photonic components on a single chip providing us with all the advantages of integration in terms of compactness, low power consumption, novel configurations and components which are pre aligned during fabrication. Nonlinear optcal process of spontaneous parametric down conversion in waveguides forms an important technique for the generation of entangled photon pairs (which form a very important resource in the field of quantum information science and technology), squeezed states and in the realization of low noise parametric amplifiers. The talk will cover how optical waveguide devices can lead to the generation and manipulation of photon pairs that are entangled in different degrees of freedom such as polarization, spatial mode, etc., the generation of hybrid entangled states, hyperentangled states and higher dimensional entangled states as well as in the generation of squeezed states and realization of low noise parametric amplifiers.", pdf: "abstract1.pdf" },

		{ title: "Imaging black holes: exterior and interior", date: "2026-02-05", time: "03:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Joydeep Chakravarty, Postdoctoral Fellow at McGill University", abstract: "We discuss a high-energy simplification which allows us to probe local physics about a bulk point using boundary correlators. We find a factorization of boundary correlators in terms of flat-space like scattering amplitudes. Our techniques also allow us to record boundary imprints of bulk causality using lightcones emerging from the bulk point. We then utilize similar extensions to study the black hole interior: the Schwarzchild singularity using the two-point function, and also obtain similar factorization leading to flat-space scattering amplitudes about an interior bulk point.", pdf: "abstract1.pdf" },

		{ title: "Science in Your Pocket", date: "2026-01-30", time: "11:00 AM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Arnab Bhattacharya, Centre Director, Homi Bhabha Centre for Science Education", abstract: " Cool experiments with a Smartphone Embark on an exciting science adventure using your phone as a versatile experimental tool! A smartphone has an amazing range of built-in sensors, allowing it to serve as an affordable and accessible lab!  A wide range of experiments in mechanics, magnetism, sound and optics can be carried out from middle school to undergraduate levels with very little extra equipment. Our group has been promoting this approach in India through the development of experiments, contributions to national-level assessments, and teacher workshops. Let's discover a range of easy and cool experiments using your smartphone. (Note: To enjoy the session, you may wish to install the phyphox app (free and open source) from the Google PlayStore or Apple App Store.)", pdf: "abstract1.pdf" },

		{ title: "Simulating solar and stellar atmospheres", date: "2026-01-19", time: "03:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Tanayveer Bhatiya (Postdoc, Max Planck Institute for Solar System Research (MPS))", abstract: " Observations of the sun reveal a dynamic and complex system, varying both in time and space. A significant part of this dynamism is driven by magnetic fields. This talk has two parts: the first part aims to give a brief overview of the physics of the sun and other sun-like stars, and the second part is on how simulations help us understand how the sun (and other stars) work.", pdf: "abstract1.pdf" },

		{ title: "Low-noise, frequency-agile photonic integrated lasers", date: "2026-01-13", time: "05:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Anat Siddharth (IITD MTech Applied Optics alum), CTO of Deeplight SA, Switzerland & Germany", abstract: " Lasers underpin modern science and technology, enabling applications from eye surgery to gravitational-wave detection and quantum information processing. Despite their ubiquity, most commercial lasers still rely on decades-old architectures that are bulky, costly, and limited in coherence and tunability. While silicon photonics has enabled scalable and compact optical systems, integrated lasers have so far fallen short in delivering the ultra-high coherence and frequency agility required beyond classical communications. In this talk, I will present recent breakthroughs achieved during my PhD at EPFL in hybrid photonic-integrated lasers that bridge this long-standing gap between bulk and integrated systems. Using wafer-scale, CMOS-compatible fabrication, we monolithically integrate piezoelectric MEMS thin films (AlN, PZT) on silicon nitride to realize ultralow-noise lasers with fast, energy-efficient frequency tuning. This approach enables up to 100× faster actuation than legacy bulk lasers while maintaining compactness and low power consumption. I will also introduce a complementary platform based on Pockels materials such as lithium niobate and lithium tantalate, enabling photonic integrated extended-DBR (E-DBR) lasers with direct electro-optic tuning. These devices exhibit low latency, high linearity, large frequency excursion, and flat actuation bandwidths up to 200 MHz. Together, these platforms establish a new class of coherent, frequency-agile integrated lasers, combining bulk-level performance with wafer-scale manufacturability. They open the door to scalable deployment in demanding applications such as distributed fiber-optic sensing, next-generation atomic clocks, neutral-atom quantum computing, and quantum key distribution. ", pdf: "abstract1.pdf" },

		{ title: "Merging Holographic and HRG EoS using a Statistical Mixture", date: "2026-01-15", time: "03:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Prachi Garella, University of Houston", abstract: " We introduce a general method to merge multidimensional equations of state (EoSs) by combining them in a two-fluid equilibrium statistical mixture in the grand canonical ensemble. The merged grand potential density ω is built directly from the input EoSs and the fluid fractions are fixed by minimizing ω at fixed temperature T and baryon chemical potential μB. Thermodynamic consistency and stability are guaranteed as all thermodynamic quantities are consistently derived from a single merged grand potential ω(T,μB) with the correct convexity properties.  Our method can accommodate a first-order phase transition and a critical endpoint with mean-field critical exponents. We use this method to merge a van der Waals Hadron--Resonance--Gas  EoS with a holographic Einstein--Maxwell--Dilaton EoS that has a critical point and a first-order line. The result is a single EoS, spanning hadronic and deconfined matter over a broad range in (T,μB), which can be readily used in heavy-ion hydrodynamic simulations. Our merging method can be generalized to consider a higher dimensional phase diagram (e.g., by considering more chemical potentials) and more than two input EoSs. ", pdf: "abstract1.pdf" },

		{ title: "On 'Noise-Friendly' Quantum Systems", date: "2026-01-13", time: "03:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Bhavay Tyagi, University of Houston", abstract: " We consider the quantum dynamics of a coupled quantum system coupled to a common correlated dissipative environment. The resulting equations of motion for both the operator moments and covariances can be integrated analytically using the Lyapunov equations. We find that for fully correlated and fully anti-correlated environments, the system relax into a phase-synchronized state that persists for long-times. We identify an exceptional point that indicates the onset of broken symmetry between an unsynchronized and synchronized dynamical phase of the system as correlations within the environment are tuned. We also show that the environmental noise correlation leads to quantum correlations between the two systems and are purely quantum mechanical in origin. ", pdf: "abstract1.pdf" },

		{ title: "Pushing the frontier of precision metrology with 87Sr optical lattice clocks", date: "2026-01-9", time: "11:00 AM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Dhruva Ganapathy, UC Berkeley", abstract: " Optical lattice clocks based on the doubly forbidden transition between the 1S0 and 3P0 states in 87Sr are at the cutting edge of precision metrology, having demonstrated fractional frequency stabilities of ~1e-18/rt(Hz). The performance of such clocks depends highly on the coherent interrogation time that can be achieved with Sr atoms. In this talk, I'll describe a differential measurement scheme that allows us to surpass limits set by laser coherence time, and the various decoherence mechanisms that affect such a measurement. Following this I will talk about the potential to apply these measurements to low frequency gravitational wave detection. ", pdf: "abstract1.pdf" },

		{ title: "Characterising X-ray Stellar Content of Our Galaxy Using Archival Data", date: "2026-01-9", time: "12:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Pooja Sharma, Thapar University", abstract: " I will present my work on the population study of the Milky Way's X-ray emitting stellar objects by combining the latest XMM-Newton (4XMM-DR13) observations with Gaia (DR3) astrometry and photometry. Using the probabilistic ARCHES cross-matching tool developed at the Observatory of Strasbourg, we identified 37,901 high-confidence optical stellar counterparts to XMM sources. The CMD revealed a prominent second sequence, which Simbad classifications showed to be dominated by magnetically active young stars and unresolved binaries. To extend classifications beyond the limited Simbad labels, we trained a deep neural network to distinguish Binaries, Evolved, Main Sequence, Peculiar, and Young stars, achieving 77% accuracy. Together, probabilistic cross-matching, multiwavelength data, and machine learning provide an efficient framework for automatically characterizing Galactic X-ray stellar populations. ", pdf: "abstract1.pdf" },


{ title: "Nuclear halos: a paradigm shifting exotic phenomenon in low and medium mass nuclei", date: "2026-01-9", time: "2:00 PM", venue: "Physics Seminar Room (MS420)", speaker: " Dr. Gagandeep Singh, National Center for Nuclear Research (NCBJ), Poland", abstract: " Out of the roughly 7000 proposed nuclei, only a handful more than 250 are stable. The rest are unstable and many are called exotic due to their peculiar properties. Halos are a special class of these exotics, characterised by enhanced matter radii. We will touch upon the world of one and two-neutron halo nuclei in low and medium mass regions and see how they have influenced directions for nuclear research. Via these halos, we will also try to discuss how nuclear reaction theory is specifically useful as an indirect method in the application of these halos for nuclear astrophysical studies, where one can compute and compare reaction rates at energies which are not feasible in present day experimental facilities. In particular, Coulomb breakup and two-neutron transfer reactions will be analysed. ", pdf: "abstract1.pdf" },


 


  { title: "Correlation Enhanced Electron-Phonon Coupling in FeSe/SrTiO3 at a Magic Angle", date: "2025-12-12", time: "04:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Sihi, Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, United States", abstract: " While electron–phonon coupling (EPC) provides a well-established framework for understanding conventional superconductors, its role in Fe-based materials, where strong electronic correlations and competing orders are prevalent, remains an open question. Here, we integrate first principles dynamical mean-field theory calculations with the epitaxial growth of single-layer FeX (X = Se,S, Te) films on SrTiO3(001) substrates, which allows us to control the FeX4 tetrahedral angle and electron correlations. Using scanning tunneling spectroscopy, we demonstrate a superconducting dome where the pairing gap peaks at a magic angle of the FeSe4 tetrahedron. Crucially, our calculations show that the electron coupling to the A1g phonon mode is maximized at this magic angle in the FeSe film. This finding reveals a significant role of electronic correlations in enhancing Cooper pairing in unconventional superconductors by strengthening the EPC. Reference: https://arxiv.org/abs/2506.22435v1 ", pdf: "abstract1.pdf" },

		{ title: "Charm susceptibilities as a probe of deconfinement from lattice QCD", date: "2025-11-25", time: "10:30 AM", venue: "Physics Seminar Room (MS420)", speaker: " Dr. Shipaz Sharma, Technische Universität München", abstract: " I will present the calculation of the generalised charm susceptibilities in 2+1 flavor QCD done on the lattice at several lattice spacings. I will show that, below the chiral crossover, these susceptibilities are well described by the hadron resonance gas (HRG) model if charmed hadrons not listed in tables of the Particle Data Group are included. However, the HRG description abruptly breaks down just above the chiral crossover. To understand this, we use a model for the charm pressure in which it is expressed as the sum of partial pressures from charmed baryons, charmed mesons, and charm quarks.  I will present continuum estimates of these partial pressures and findings which show that, while the partial pressures of charmed mesons and baryons drop below their respective HRG predictions, the charm quark pressure becomes non-zero above the chiral crossover.", pdf: "abstract1.pdf" },

		{ title: "Visualizing correlated ground states using quantum oscillation in twisted graphene", date: "2025-11-20", time: "11:00 AM", venue: "Physics Seminar Room (MS420)", speaker: "Indranil Roy (Rutgers University, New Jersey, USA)", abstract: "SQuantum oscillations originating from the quantization of electron cyclotron orbits provide sensitive diagnostics of electron bands and interactions. I’ll present nanoscale imaging data of the thermodynamic magnetization oscillations caused by the de Haas–van Alphen effect in moiré graphene. Scanning superconducting quantum interference device (SQUID)–on-tip in Bernal bilayer graphene crystal axis-aligned to hexagonal boron nitride, reveals large magnetization oscillations with amplitudes reaching 500 Bohr magneton per electron in weak magnetic fields, unexpectedly low frequencies, and high sensitivity to superlattice filling fraction. The oscillations allow us to reconstruct the complex band structure, revealing narrow moiré bands with multiple overlapping Fermi surfaces separated by unusually small momentum gaps. We identified sets of oscillations that violate the textbook Onsager Fermi surface sum rule, signaling formation of broad-band particle-hole superposition states induced by coherent magnetic breakdown. [1] We extend the quantum oscillations measurement to study Coulomb interaction effects in twisted trilayer graphene. We find that the charging self-energy due to occupied electronic states, is critical in explaining the high carrier density physics. At half-filling of the conduction flat band, we observe a Stoner-like symmetry breaking, suggesting that it is the most robust mechanism in the hierarchy of phase transitions. On approaching charge neutrality, where the charging energy is negligible and exchange energy is dominant, we find the ground state to be a nematic semimetal which is favored over gapped states in the presence of heterostrain. In the revealed semimetallic phase, the flat-band Dirac cones migrate towards the mini-brillouin zone center, spontaneously breaking the 𝐶3 rotational symmetry. [2] Coauthors: Matan Bocarsly, Matan Uzan, Vishal Bhardwaj, Patrick Ledwith, Gal Shavit, Zhiyu Dong, Sameer Grover, Jiewen Xioa, Nasrin Banu, Yaozhang Zhou, Mikhail Labendik, Aviram Uri, Martin E. Huber, Yuri Myasoedov, Kenji Watanabe, Takashi Taniguchi, Leonid Levitov, Yuval Oreg, Dan Parker, Binghai Yan, Yuval Ronen, and Eli Zeldov", pdf: "abstract1.pdf" },

		{ title: "Doubly Separable Spacetimes and Symmetry Constraints on their Self-Gravitating Matter Content", date: "2025-10-09", time: "03:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Mr. Prashant Kocherlakota, Harvard University", abstract: "Solution-generating techniques are often used to construct stationary, axisymmetric spacetimes in general relativity. In this talk, I will revisit a variant of the Newman–Janis algorithm and show that it  yields only highly symmetric 'doubly separable' spacetimes, where both  the geodesic and scalar-wave equations separate. The strong symmetry of these geometries imposes stringent constraints on possible matter sources. We will see that they cannot arise from massless scalar fields or perfect fluids, and that electromagnetic sources lead only to the Kerr–Newman family. While such metrics are useful for studying black hole shadows and quasinormal modes, our results underscore that not all algorithmically generated spacetimes correspond to physically consistent matter configurations.", pdf: "abstract1.pdf" },

		{ title: "Aspects of black holes in AdS spacetimes", date: "2025-09-26", time: "03:30 PM", venue: "Physics Library (behind the physics office)", speaker: "Mr. Kaustubh Singhi, ICTS-TIFR in Bangalore", abstract: "We will see two puzzling features of black holes. The first of  these is that our present understanding of general relativity suggests an inconsistency stemming from the fact that there are spacetime singularities behind the black hole horizon. The second is related to the fact that black holes seem to behave like thermodynamic systems with a finite temperature and entropy. A common way to arrive at this conclusion is using path integral methods where classical black hole  solutions appear as saddle points. We will discuss black holes in AdS spacetimes because these spacetimes are dual to non-gravitational gauge theories. It is now a common hope that the singularity problem for AdS black holes can be addressed using the dual system. But to do so we must first understand how the information of the black hole singularity is encoded on the dual side. We will find some specific signatures of black hole  singularities in correlators in the dual theory. We will review some thermodynamic features of AdS spacetime including  the famous Hawking-Page transition. Because of the duality with a gauge  theory, the transition serves as a prediction for the confinement-deconfinement phase transition. Although this part of the analysis is fine, we will see that there is a gap in our understanding of the path integral which helps us form these conclusions. The gap is that there are complex saddle points of the path integral which can dominate at low temperatures and ruin our expectations from AdS/CFT. We will remedy the situation by using approximation techniques and tools from analysis.", pdf: "abstract1.pdf" },

		{ title: "Hawking radiation from acoustic black holes in relativistic heavy ion collisions and in hydrodynamical flow of electrons", date: "2025-09-18", time: "04:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Ajit M. Srivastava, Institute of Physics, Bhubaneswar, Raja Ramanna Chair Professor", abstract: "Acoustic black holes are formed when a ﬂuid ﬂowing with subsonic velocities accelerates and becomes supersonic. When the ﬂow is directed from the subsonic to supersonic region, the surface on which the normal component of ﬂuid velocity equals the local speed of sound acts as an acoustic horizon. This is because no acoustic perturbation from the supersonic region can cross it to reach the subsonic part of the ﬂuid. One can show that if the ﬂuid velocity is locally irrotational, the ﬁeld equations for acoustic perturbations of the velocity potential are identical to that of a massless scalar ﬁeld propagating in a black hole background. One, therefore, expects Hawking radiation in the form of a  thermal spectrum of phonons. We discuss this possibility for the case of relativistic heavy-ion collisions where this Hawking radiation should be observable in terms of a thermal component in the rapidity dependence of the transverse  momentum distribution of detected particles. We also discuss the case of hydrodynamic ﬂow of electrons in condensed matter systems where the resulting Hawking radiation will appear in terms of current ﬂuctuations.", pdf: "abstract1.pdf" },

		{ title: "Quantum Interference and Localization in Disordered Graphene", date: "2025-09-11", time: "04:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. R. Podila, Clemson University, USA", abstract: "We report direct experimental evidence for Anderson localization driven by quantum interference in disordered single-layer graphene induced via controlled Ar+ ion irradiation. By systematically introducing defects and quantifying the disorder using the Raman I_D/I_G ratio, we map the inter-defect distance L_D and uncover a critical localization threshold near L_D ≈ 20 nm, where multiple transport and spectroscopic signatures converge. Time-resolved reflectivity measurements reveal a non-monotonic dependence of the carrier relaxation times \tau_{1,2}, peaking at L^*_D, indicating the emergence of spatially localized states. Tight-binding simulations confirm this threshold as the crossover between delocalized and exponentially localized regimes, satisfying the Ioffe–Regel condition kF*l = 1. Electrical resistivity increases exponentially below L^*_D, while Seebeck coefficients saturate, consistent with hopping-dominated transport. Notably, the power factor S^2/\rho and the thermoelectric figure of merit zT exhibit pronounced maxima near L^*_D, corroborating theoretical predictions that localization can enhance thermoelectric performance by introducing sharp energy filtering at mobility edges. While graphene’s intrinsic zT remains low due to high thermal conductivity, these results establish graphene as a model system for probing disorder-driven transport, offering the most direct experimental validation to date of localization-enhanced thermopower in two-dimensional Dirac systems.", pdf: "abstract1.pdf" },

		{ title: "Radiation Effects in Metal-Halide Perovskites: Implications for Space Power", date: "2025-09-10", time: "03:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Ahmad Kirmani, Rochester Institute of Technology, NY, USA", abstract: " Our expanding extraterrestrial presence and exponential growth of the space economy demand a new generation of scalable, low-cost, and space-tolerant electronics. While silicon and III-V semiconductors have long dominated space power systems, a new class of materials – metal-halide perovskites (MHPs) – is fast emerging as a promising candidate for next-generation space photovoltaics. While their legacy application is expected to be terrestrial photovoltaics, MHPs’ counterintuitive radiation tolerance is rapidly making a case for their space power potential. How can such delicate lattices withstand harsh radiation environments? In this talk, I will delve into this paradox challenging existing assumptions and highlighting that lattice vibrations play a key role in healing radiation-induced displacement damage. While radiation creates significant damage, a serendipitous combination of low-frequency phonons, strong electron-phonon coupling, and low thermal conductivity enables phonon-assisted dynamic defect annealing almost instantaneous recovery via atomic reconfiguration. Nevertheless, I will caution that this ability of MHPs to self-heal could very well be their Achilles’ heel when extreme thermal fluctuations are present: such as during thermal cycling and under ionizing irradiation. I will corroborate this hypothesis by offering fresh experimental evidence showing extensive and irrecoverable damage by electrons owing to ionization effects. I will conclude by addressing the broader challenges in assessing the full potential of MHPs for space missions and outlining critical areas for future exploration. Ultimately, I hope to motivate a broader conversation on how soft, self-adaptive semiconductors like MHPs could redefine our path toward resilient and sustainable power systems in space and other extreme frontiers.", pdf: "abstract1.pdf" },

		{ title: "Exploring Materials Physics with AI: Connecting Band Images and Atomic Structures through Image-Based Learning", date: "2025-08-12", time: "04:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Sanghamitra Neogi, University of Colorado Boulder", abstract: "AI-assisted approaches have significantly accelerated materials design and discovery by revealing complex structure–property relationships. In this talk, I will present how my research leverages image-based learning and generative machine learning models to address key challenges in materials physics—bridging atomic structures, experimental data, and device-level behavior. My group at the University of Colorado Boulder develops analytical and computational frameworks to investigate phononic, thermal, electronic, thermoelectric, and quantum properties across a wide range of material systems. Guided by an atom-to-device research philosophy, we aim to connect atomic-scale physics to the emergent behavior of nanostructures and devices, establishing direct links between simulation and experiment. Towards this objective, we are exploring how recent advances in AI and spectroscopy can help bridge modeling and experimental data more directly. Traditionally, forward modeling starts from a known atomic structure to predict material properties such as electronic band structures. While powerful, this approach can be inefficient for discovering materials with desired properties, requiring costly trial-and-error searches. Meanwhile, experimental techniques such as angle-resolved photoemission spectroscopy (ARPES) generate high-resolution images that encode this information directly. I will present an AI-assisted framework that learns from band structure images, computed from DFT or obtained via ARPES, and connects them to the underlying atomic structures. This approach not only strengthens the connection between modeling and experiment but also lays the groundwork for data-driven inverse design of materials with targeted electronic properties.", pdf: "abstract1.pdf" },


		{ title: "Novel phenomena in the quantum walk of interacting particles", date: "2025-07-21", time: "04:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Tapan Mishra, NISER", abstract: "Non-equilibrium dynamics of many-body quantum systems reveal interesting scenarios and have been the topic of intense research in recent years. However, such problems are often found to be challenging to address both theoretically and experimentally. In this context, the dynamics of few interacting particles or the quantum walk provides a bottom-up approach to understand many-particle dynamics and at the same time reveal novel phenomena which are completely different from their many-body counterparts. In this talk, we will discuss some of the interesting phenomena that emerge from the quantum walk of interacting particles on one dimensional lattices. In the first part of the talk, we will show the formation of a non-trivial doublon or repulsively bound pairs in systems of interacting bosons as well as fermions. In the second part we will discuss the dynamics and localization of bound states on a spin chain. For both the cases, we will present results using classical as well quantum computing simulations.", pdf: "abstract1.pdf" },

		{ title: "Understanding the Heftiest and Shiniest: Growing Giant Black Holes and their role in Galaxy Evolution", date: "2025-07-18", time: "03:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Prajval Shastri", abstract: "Giant black holes that inhabit the centres of galaxies are the most massive objects we know. Evidence suggests that such black holes play a significant role in regulating galaxy assembly by impacting their environments out to spatial scales that are well beyond their gravitational sphere of influence. They appear to do so when they accrete matter to grow, also becoming the most luminous objects we know. In this talk, there will be a discussion on the various strands of the story of these discoveries.", pdf: "abstract1.pdf" },

		{ title: "Multipartite entanglement monotones", date: "2025-06-6", time: "03:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Abhijit Gadde (TIFR Mumbai)", abstract: " If we want to transform the quantum of state of a system to another using local processes, what is the probability of success? It turns out that this probability can be bounded by quantifying entanglement within both the states. We construct a family of multipartite entanglement measures that are monotonic under local operations and classical communication on average. The measures are constructed out of local unitary invariant polynomials of the state and its conjugate, and hence are easy to compute for pure states. In this talk I will also review the past results that enable our analysis.", pdf: "abstract1.pdf" },

		{ title: "Quantum sources for sensing, communication, and computation", date: "2025-05-22", time: "03:00 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Goutam Samanta, PRL Ahmedabad", abstract: "Entangled photon sources are of paramount importance not only for fundamental research but also for various applications in real-world quantum communications and quantum computing. However, the realization of next-generation envisaged projects towardsimplementing the worldwide quantum network through ground-to-satellite and or intersatellite links requires the development of compact and robust entangled photon sources with high brightness and entanglement purity. Typically, the entangled photons are generated through the nonlinear parametric process. However, the efficient nonlinear optical processes governed by the phase-matching conditions are sensitive to the temperature of the nonlinear crystals and the wavelength of the pump laser and demand stringent requirements for constant crystal temperature and mode-hop-free pump laser. In this lecture, I will discuss the development of quantum photon sources based on the spontaneous parametric down-conversion (SPDC) process for generating correlated photon pairs. I will also present our efforts to develop high-brightness entangled photon sources that are robust against pump laser mode hops and crystal temperature fluctuations, and highlight their applications in quantum sensing, communication, and computing ", pdf: "abstract1.pdf" },

		{ title: "Quantum computing and quantum-inspired oscillator-based Ising computing for solving combinatorial optimization problems", date: "2025-05-13", time: "03:00 PM", venue: "CARE Committee Room (Room-101, Block-III)", speaker: "Dr. Debanjan Bhowmik, Associate Professor, EE Dept., IIT Bombay", abstract: " Combinatorial optimization problems are not only of academic interest because of their NP-Hard nature but also surface in various industry applications: drug discovery, vehicle routing, delivery scheduling, VLSI routing, etc. Such optimization problems, when solved exactly on conventional classical digital computing hardware, take exponential time for solution. In this talk, we will discuss two alternative ways of solving such problems using the Ising Hamiltonian formulation for the problems:1. Quantum computing, more specifically quantum approximate optimization algorithm (QAOA) implemented on noisy intermediate-scale quantum (NISQ) hardware 2. Quantum-inspired oscillator Ising machines (OIM) with implementation through CMOS + X (Emerging devices like ferroelectrics and spintronics) systems. Solution of such optimization problems through the above emerging hardware, both for academic problems like Max-Cut and industry problems like symbol decoding in multi-input multi-output (MIMO) wireless communication systems, will be discussed.", pdf: "abstract1.pdf" },

		{ title: "Waves ... Linear, Nonlinear, Extra-Nonlinear", date: "2025-05-02", time: "03:30 PM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Suktisama Ghosh, Ex. Professor, Indian Institute of Geomagnetism, Mumbai", abstract: " Waves are ubiquitous. They mean propagation of perturbation. At the same time, they carry energy and information. Hence they are important. Waves can be classified as longitudinal or transverse, depending whether the perturbations are along or across the wave vector, and linear or nonlinear, depending whether it is a small or large amplitude phenomena. Familiar examples of longitudinal waves are sound waves, ion or electron acoustic waves, arising from longitudinal density perturbations of the charged particles in plasmas, or the LIGO ‘space waves, depicting longitudinal perturbations of the space arising from the collision of black holes. On the other hand, water waves and electromagnetic waves are transverse in nature where the fluid or the electromagnetic field oscillates across the wave vector. In linear regime, small amplitude waves follow Fourier superposition principle, are categorized by their respective dispersion relations, and are described by linear partial differential equations (PDEs). However, due to the availability of free energy sources, waves may grow to large amplitudes when the superposition principle is no longer valid and the waves are often described by nonlinear PDEs. Needless to say, nature is often nonlinear. On one hand, it definitely increases the degree of the complexity but on the other hand, it also gives rise to many interesting phenomena, like wave breaking (example: large amplitude ocean waves), organized coherent structures, like solitons and double layers, and non coherent phenomena, like turbulence and chaos. Organized structures, arising due to the balance between nonlinearity and dispersion, are of particular interest as they are ubiquitous and occur across different medium.The magnetospheric boundary layers around the Earth are characterized by sharp discontinuities in plasma parameters, instigating instabilities and wave growth. Satellite observations revealed organized, coherent, unipolar and biplolar structures in the electrostatic field in the magnetospheric boundary layers. They are commonly known as electrostatic solitary waves (ESWs). It is often customary to theoretically interpret them as ion or electron acoustic solitary waves (bipolar structures) or double layers (unipolar structures), or BGK mode solutions. However, recent observations with high resolution instruments revealed more and more nonconventional electrostatic structures whose morphology differs from the usual one. Interestingly, recent graphical analysis of nonlinear electrostatic waves in plasmas (Sagdeev pseudo-potential method) revealed extra nonlinear structures like Folded Solitary Waves (FSWs) and (Folded Double Layers (FDLs) which may well be a good candidate to interpret such non conventional observations. There are also satellite observations of localized structures in 2D. A well developed mathematical theory of ‘dromions’, exponentially localized structures in 2D, is already in place, and may well be explored for its possible applications.", pdf: "abstract1.pdf" },

		{ title: " A short journey through terahertz physics: from air-plasma source to the generation of multiple-vortex beams and hyper-Raman spectroscopy", date: "2025-04-21", time: "11:30 AM", venue: "Physics Seminar Room (MS420)", speaker: "Dr. Eric Freysz, directeur de recherche Emerite au CNRS and Senior Member of Optica (former Optical society of America)", abstract: " Terahertz (THz) sources available nowadays are able to cover a very broad spectral range spanning from 100 GHz up to 50 THz. Since the THz photons can excite and probe the far-IR modes of variety of different materials (gas, liquid, solid), their applications are exploding in many different fundamental and applied fields. During this talk, I will give a short overview over our most recent works in the THz field.  At first, I will present our investigation about the far-field THz beam profile generated from an air plasma source. Indeed, while plasmas generated in air by two-color femtosecond laser pulses are a well established technique to generate ultra-short (~10 fs) and intense THz field (~GV/cm), the generated THz field pattern is still under debate for complete details. I will show that the combination of different THz imaging techniques makes it possible to address this debate. In the second part, I will present a simple way to generate multiple vortex-beams with multiple topological charges. We will show that an array of up to 2x2 vortex beams with multiple topological charges can be generated. The advantage and limitation of the method we implemented will be discussed. Towards the end, I will present THz hyper-Raman spectroscopy of a silicon wafer, where I will show that such a time-resolved spectroscopy makes it possible to follow easily the very rapid and strong population of the optical phonons induced by the hot carriers generated by sub-picosecond IR pulses. It gets initiated over a few hundreds of femtoseconds and lasts throughout the duration of the near-IR pulse.", pdf: "abstract1.pdf" },

		{ title: "Novel Applications of Power Over Fiber in the DUNE FD-VD Detector", date: "2025-04-07", time: "11:30 AM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Biswaranjan Behera, South Dakota School of Mines and Technology in the USA", abstract: " The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline neutrino experiment designed to study neutrino oscillations with unprecedented precision. It will utilize an intense neutrino beam directed from Fermilab (Chicago) to two detector complexes: a near detector at Fermilab and a far detector located approximately 1.5 km underground at the Sanford Underground Research Facility (SURF) in South Dakota. One of the far detector (FD) modules will implement the Vertical Drift (VD) liquid argon time projection chamber (LArTPC) technology, where ionized electrons drift vertically from a cathode plane positioned at mid-height within the active volume. The photon detection system (PDS) will be installed along the cathode and behind the field cage to enhance photon collection efficiency. However, the presence of high voltage (~300 kV) at the cathode prevents the use of conventional copper cables for power delivery. To address this, Power-over-Fiber (PoF) technology will be deployed, enabling optical power transmission via optical fibers to the PDS. In this talk, I will present the ongoing R&D efforts to develop and validate PoF components for operation in harsh environments and discuss its novel application in the VD photon detection system.", pdf: "abstract1.pdf" },

		{ title: "Quantum communications for fundamental studies and applications", date: "2025-04-03", time: "10:30 AM", venue: "Physics Seminar Room (MS420)", speaker: "Prof. Paolo Villoresi, Department of Information Engineering, University of Padua", abstract: " The exchange of quantum states is the most fundamental level of communications. Notwithstanding the difficulties due to the weak signal, it enables protocols that goes beyond the classical ones. Current realizations of quantum communication systems allow for very important test of quantum physics, recently extended also to include affected due to relativity. The applications of quantum communications are also exploited in many continents, supported with important investments. We shall address both areas with the focus on the development of these sectors seems that its inception for the quantum channels in space and on the ground. The evolution of quantum random number generation will also be addressed.", pdf: "abstract1.pdf" },


		{ title: "Light Nuclei Femtoscopy and Baryon Interactions at RHIC", date: "2025-03-19", time: "3.30 PM", venue: "Physics Committee Room", speaker: "Dr. Neha Shah, IIT Patna", abstract: "  Unveiling the interactions between baryons plays a fundamental role in understanding the strong interaction and determining the equation of state of dense nuclear matter. In heavy-ion collisions, the measurements of two-particle femtoscopic correlations have proven to be a powerful tool for gaining insights into the space-time geometry of the particle emitting sources, as well as the interactions between pairs of particles. In this talk, I will be focusing on recent femtoscopy measurements from the STAR experiment at RHIC using this tool. Light nuclei, such as the deuteron, consist of loosely bound nucleons with binding energies on the order of several MeV. Conducting femtoscopic measurements between pairs of particles involving light nuclei has significant relevance for the investigation of few-nucleon systems. Furthermore, by analyzing the femtoscopic correlations of light nuclei, we can gain insight into the nature of their production mechanisms. I will discuss the femtoscopic measurement of light nuclei pairs, p-d and d-d, in Au+Au collisions at √s_NN = 3 GeV, strong interaction parameters and the production mechanism. H-dibaryon, containing six quarks, uuddss, is one of the most searched exotic particles in the field of hadron physics. Many experiments have tried to look for the H-dibaryon, however, no evidence is found yet to claim their existence. The formation of deuterium-like H-dibaryon very much depends on ΛΛ, ΣΣ, and NΞ interactions. These interactions are also important to understand dense nuclear matter. I will discuss the high-statistics measurements of pΞ and ΛΛ correlation functions in Isobar (Ru+Ru, Zr+Zr) and Au+Au collisions at √s_NN = 200 GeV and their implications on the existence of the H-dibaryon.", pdf: "abstract1.pdf" },

		{ title: "One day symposium on Twistronics and Moire's patterns in van del Waals heterostructures organized under INDIA-ISRAEL SPARC PROJECT, supported by Ministry of Education, Govt. of India", date: "2025-03-3", time: "One day", venue: "Senate Room, (Main buidling, 1st floor)", speaker: "Mandar M. Deshmukh (TIFR, Mumbai), Priya Mahadevan (SNBNCBS, Kolkata), Manish Jain (IISc, Bangalore), Aveek Bid (IISc, Bangalore), Anindya Das (IISc, Bangalore), Shahal Ilani  (Weizmann Institute of Science, Israel), Nadav Auerbach  (Weizmann Institute of Science, Israel), Disha Arora (IIT Delhi), Deepanshu Aggarwal (IIT Delhi)", abstract: " The objective of symposium is to bring together researchers to discuss recent advances in field of twistronics. This symposium is in the memory of late Prof. Assa Auerbach (Technion, Israel Institute of Technology, Haifa), who was associated with the SPARC project from Israel.", pdf: "abstract1.pdf" },

		{ title: "Quantum Computing and its Applications to Atoms and Molecules", date: "2025-03-3", time: "3 PM", venue: "LH-316", speaker: "Prof. Bhanu Pratap Das, Centre for Quantum Engineering, Research and Education (TCG CREST), Kolkata and Department of Physics, Tokyo Institute of Technology (currently Institute of Science Tokyo), Japan", abstract: " Quantum computing is currently one of the most important areas  of science and technology. Research in this field is being performed in universities, research institutes and companies in many countries in the world. In India, the National Quantum Mission will soon get underway. Quantum computing has the potential to create an unprecedented revolution in science and technology as it could have a very strong impact in many areas of science and society. It is based on the power and uniqueness of quantum mechanics. This talk will focus on the basics of this field and the current status of its applications to properties of atoms and molecules using digital quantum computers and quantum annealers.", pdf: "abstract1.pdf" },

		{ title: "Using Gravitational Waves to see the Early Universe", date: "2025-02-17", time: "5 PM", venue: "MS420", speaker: "Dr. Rishav Roshan from the University of Southampton, UK", abstract: " Gravitational waves are a unique probe of the early Universe, as the Universe is transparent to gravitational radiation right back to the beginning. Here, I will summarise some of the different scopes of primordial events that could lead to a detectable stochastic gravitational wave background. Any such background would shed light on what (if anything) lies beyond the Standard Model, sometimes at remarkably high scales. I will also briefly overview the physics behind stochastic gravitational wave background before delving deep into some of the major primordial events that can source such a background.", pdf: "abstract1.pdf" },


		 { title: "There is plenty of room for room temperature superconductivity in quantum spin Liquid", date: "2025-02-11", time: "5 PM", venue: "MS420", speaker: "Prof. G. Baskaran, IIT Madras, IMSC Chennai and Perimeter Institute, Canada", abstract: " Bednorz-Muller's discovery of high  superconductivity in cuprates, initiated RVB theory, where high  superconductivity emerges in a doped Mott insulator, in the background of a quantum spin liquid. I will present theoretical arguments, for the possibility of ambient superconductivity, via RVB mechanism, within limits of solid-state/quantum-chemical constraints. A variety of materials exhibiting superconductivity at ambient conditions are continuing to be reported experimentally. However, superconductivity seems unstable, elusive and statistical. RVB theory guided materials search and synthesis, to find stable superconductivity at room temperatures and ambient conditions, will be outlined.", pdf: "abstract1.pdf" },

		 { title: "Optical atomic clocks: prospects for a redefinition of the SI second", date: "2025-02-19", time: "3:30 PM", venue: "MS420", speaker: "Prof. Brajesh K Mani, IIT Delhi", abstract: " Atomic clocks are one of the most accurate time measurement devices in existence till today. Due to their unprecedented  accuracy, they are used in a plethora of fundamental and practical applications such as navigation systems, quantum computer, telecommunications and military devices, probing variations in the fundamental constants, etc.  As another key application, the current SI unit of time is based on the atomic clocks. One second is defined as the time it takes for 9,192,631,770 cycles of radiation to occur between two hyperfine levels of the cesium-133 atom. However, after the demonstration of femtosecond frequency comb in 2000,  clocks based on optical transitions in ions or neutral atoms have been developed with accuracies two orders of magnitude higher than that of the Cs standards. The immense progress on optical atomic clocks across the globe in the last two decades envisions a possible redefinition of the SI second by 2030. In this colloquium, I shall provide a brief introduction to the optical clocks in consideration in India and abroad and shall discuss the possible candidates for redefining the second. I shall also share some of the works we do in this direction in our group at IIT Delhi.", pdf: "abstract1.pdf" },

		  { title: "QCD-Gravity double-copy in the Regge regime via shockwave collisions", date: "2025-02-12", time: "3:30 PM", venue: "MS420", speaker: "Dr. Himanshu Raj, Stony Brook University", abstract: " We present new results for gravitational wave radiation in ultrarelativistic collisions of black holes which are described as Aichelburg-Sexl shockwaves. We demonstrate that the effective Lipatov vertex governing graviton radiation is a mathematical double copy of the corresponding effective gluon emission vertex in heavy-ion collisions [1,2]. We also show that propagators in the gravitational shockwave background are double copies of the corresponding propagators in the gluon shockwave background [3]. We present the gravitational BFKL equation and comment upon its solution and similarities to the QCD case [4]. The existence of these double-copy relations suggest that CGC-based techniques that describe the energy evolution of gluon radiation in QCD can similarly be applied to study the gravitational wave radiation spectrum in the context of trans-Planckian scattering.", pdf: "pdfs/IITD.pdf" },

            { title: "Reconciling cosmological tensions with inelastic dark matter and dark radiation.", date: "2025-01-29", time: "3:30 PM", venue: "MS420", speaker: "Dr. Satyabrata Mahapatra, Sungkyunkwan University in South Korea", abstract: " In this talk  I will introduce a novel particle physics framework addressing multiple cosmological tensions, including discrepancies in the Hubble parameter, S8, and Lyman-\alpha forest data. This model, SIDR+z_t (Self-Interacting Dark Radiation with transition redshift), features an inelastic dark matter (IDM) scenario coupled with dark radiation under a dark gauge symmetry. The model incorporates cold dark matter, strongly interacting dark radiation, and their interactions, suppressing free-streaming effects and attenuating the matter power spectrum at small scales. The inelastic nature of dark matter introduces a distinct temperature-dependent interaction rate, crucial for resolving Lyman-\alpha discrepancies. Solving the relevant Boltzmann equations, we explore the model's consistency with Big Bang Nucleosynthesis and its ability to produce additional contributions prior to recombination while achieving the correct dark matter relic density. ", pdf: "https://drive.google.com/file/d/1AeoDabEzuDf59xElBg2JJz1C1dMkz2qL/view?pli=1" },
 
            
            
			{ title: "A First-Principles Approach for Predicting the Catalytic Properties of Multimetallic Surfaces", date: "2025-01-28", time: "4:30 PM", venue: "MS420", speaker: "Dr. Shikha Saini, MIT", abstract: "Multimetallic alloys (MMAs) have sparked tremendous interest in engineering low-cost materials with high activity and selectivity in heterogeneous catalysis. Multimetallic systems provide complementary functionalities and an unprecedented tunability when designing catalyst formulations. However, due to their immense structural and compositional complexity, the investigation and identification of an optimal catalyst is a tedious and time-consuming process, both experimentally and theoretically. Recent developments in predicting potential MMAs rely on machine learning models, which require a significantly large training dataset to design the framework for MMAs. Therefore, theoretical design principles are highly desirable to accelerate the screening of catalyst structures across the vast compositional space.  In this talk, I will present a simple and general model for predicting the site stability of multi metallic surfaces and nanoparticles, based on physical principles. The model requires only a small set of density functional theory (DFT) calculations of metal atom binding energies of monometallic and dilute alloy surface slabs to optimize the parameters in the simple model. These parameters depend solely on the identity of the metal site and its local coordination environment. The resulting model allows for the quantification of the stability of any particular atom site in any conceivable chemical environment across a wide range of morphologies, sizes, and arrangements by interpolating the derived parameters from a monometallic system to a completely diluted alloyedsystem. This approach is highly efficient and easily transferable to other and more complex multi metallic systems regardless of the percentage of the constituting elements. Hence, the proposed theoretical framework provides a robust approach to discovering new alloy catalysts through rapid screening at the atomistic level", pdf: "https://owncloud.iitd.ac.in/nextcloud/index.php/s/y3BN5YtXodkRMQf" },
            
			{ title: "Feynman diagrams live in conformal families", date: "2025-01-27", time: "4 PM", venue: "MS420", speaker: "Mr. Siddharth Prabhu, TIFR, Mumbai", abstract: " Feynman diagrams, and the associated Feynman integrals are of central importance in connecting the theory of elementary particles with experiments, such as those performed in colliders. On the other hand, conformal integrals routinely make an appearance in the computation of conformal correlators, conformal blocks, and other conformally covariant objects. We show that every Feynman diagram with massless internal fields is a limit of a conformal integral. This leads to a classification of Feynman diagrams into conformal families, labelled by the head of the family, a conformal integral. Computing the conformal integral in each family suffices to compute all the Feynman diagrams in the family exactly. Using known exact results for some conformal integrals, we present the solutions to the other Feynman diagrams in the corresponding families. These are answers to either finite or dimensionally regularized Feynman diagrams to all orders in the regularization parameter.", pdf: "abstract3.pdf" }
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