Condensed Matter Physics
Recent Interest:
Strongly correlated electron systems and many body theory, please visit group homepage for details.
For a flavor of research acitivities in our group and by colleagues with similar interests in the area of strong correlation physics, materials theory and topology, please visit our weekly Journal Club webpage
Non-trivial topology in magnetism: Skyrmion
Topology in band theory
Ab initio theory on transverse transport
Ultrafast dynamics in magnetic system
Strongly correlated electron systems
Quasicrystals modeling using Molecular Dynamics Simulation
Ultra-cold atoms and Quantum Optics
Quantum Chromodynamic (QCD) phase diagram, Transport properties of QCD matter and various signatures of Quark Gluon Plasma.
Dark Matter Search
AdS-CFT correspondence, Calabi-Yau metrics, Black hole entropy, Black rings
Recent Papers
Research Grants
Computational Materials Scieince from first principles and model Hamiltonian
- magnetism, catalysis, transport, topological protection of states in the lightest lowdimensional systems - graphene, hexgonal boron nitride, germanene , etc. and their hybrids
- methods and applications for inexpensive computation and analysis of ground and excited states
INTRODUCTION:
With the aim of proposing new materials and methodologies towards solving some of the contemporary problems faced by humanity, such as, securing clean green energy resources and environment, our group focuses on computationally understanding electronic, optical and magnetic properties, and their interplay in primarily low-dimensional systems from first principles as well as model Hamiltonian. We compute and analyse electronic structure of the ground and excited states in layered structures made of the lightest of the elements known to self-assemble into extended structures in normal temperature and preassure, namely, boron, carbon, nitrogen, oxygen and the elements below them in the peridic table, within the frameworks of density functional theory with refinements to include self-energy corrections and correlations through mean-field approximation of Hubbard model.
• Dirac Physics in Topological Insulators and Graphene
• Dissipative effects in Topological materials
• Study of strong correlations in Ultracold Bosons
• Floquet topological phenomena
• Dissipative open quantum systems
• Quasicrystals
Statistical physics of complex and disordered magnetic systems, Out-of-equilibrium systems, Phase transitions and critical phenomena
High energy physics, Particle physics phenomenology, Perturbative corrections in QCD and EW theory, Scattering amplitudes, Feynman integrals
Electronic Structure Theoryc, Density Functional Methods & Computational Materials Science
Ion beam induced modification
Nanowires and nano-particle synthesis for photonic application
Nanophotonics/Plasmonics
Physics related to the Top quark and Beyond Standard Model (BSM) Higgs boson(s), at the Large Hadron Collider (LHC)
CP violation (B-physics), Beyond Standard Model Physics, Neutrino oscillation
My groups research is majorly focused on scientific understanding of the charge transport and photo-physics of organic semiconductors, perovskites, self-assembled nano-structures and 2D materials. These unconventional semiconductors exhibit a rich variety of transport phenomena and disorder mechanisms which are not exhibited by conventional inorganic semiconductors such as silicon. Moreover, these semiconducting materials are also evolving as an alternative to conventional semiconductors. We utilize a range of electrical, spectroscopy, microscopy and structural characterization to obtain an understanding of the processes/instabilities in these materials. The fndamental understanding developed is then applied into developing high efficient photovoltaic, ultra-bright LEDs, low power flexible electronics and improved medical diagnostic technologies.
The conventional weakly correlated systems are often described by the interaction of a single electron with its environment, for example, semiconductors. In contrast, the properties of the so-called strongly correlated states are determined by the collective interaction of many electrons via their charges and spins. The complexity that arises from such interactions between many particles gives rise to many fascinating phenomena. This covers the long-range magnetic order to recent discoveries like superconductivity, colossal magnetoresistance, and topological magnetic or electric states. Owing to their multi-particle nature, the microscopic understanding of the ground state with such dominant strong-correlation phenomena is a demanding task. For a thorough understanding, it is thus indispensable, however, to go away from the ground state and study the dynamical behavior of such systems.
On one hand, the functionality of a device always results from bringing it away from its ground state. Nevertheless, studying the non-equilibrium behavior of the ground state reveals the microscopic processes at work, stabilizing a strongly correlated state. Over the last years, various experimental and theoretical tools have been rapidly improving, and the field of strong-correlation dynamics is now in the process of establishing itself as a new and powerful branch in condensed-matter research. Because of the emerging nature of the field, research activities are still ambiguously diverse. Important advances are made in certain directions but at the same time, other aspects of crucial significance are disregarded -- an overarching coherence of the field yet needs to be established.
The broad scope and extent of our research direction in NISER is to substantially promote this overarching coherence and contribute to building a solid foundation in the field of strong correlation dynamics. The primary research topics involve, in a broad manner: (a) Coherent low-energy excitation of correlated states and (b) Studying phase-resolved dynamics of elementary excitations.
Our broad research area is to study the properties of nanomagnetism and spintronics.
Magnetic domains and domain wall dynamics
1. Disordered spin systems.
2. Stochastic processes in biology
3. Lattice models of polymers
4. Entropy driven phase transitions
5. Conformal bootstrap and critical phenomena.
6. Nonequilibrium Statistical Mechanics
7. Constraint Satisfaction problems from theoretical computer science.
Applications of Machine Learning in Theoretical High Energy Physics,
Thermal Conformal Field Theory,
Thermodynamics of Black Holes in Supergravity,
Relativistic and non-relativistic Hydrodynamics,
Carrollian Hydrodynamics
Cosmology with Cosmic Microwave Background Radiation
Dust Polarization
Primordial Gravitational waves
Cosmology with Thermal Sunyaev-Zel'dovich effect
Galactic magnetic fields
Statistical tools in Cosmology
Filamentary structure of interstellar medium
1. Nature of low the temperature phases of magnets
with competing interactions.
2. Physics of dipolar interactions in geometrically frustrated magnets.
3. Study of the entanglement content of ground states of quantum magnets.
4. Computational approaches to lattice models.
String Theory is currently the most developed approach to quantum gravity and a promising framework for the unification of fundamental interactions. Apart from moving towards the long term goal of delivering a unified theory of quantum gravity and other interactions, string theory research has led to the development of tools and techniques which throw new light on problems in field theory, condensed matter physics, classical gravitation and mathematics.
Black Holes provide an intriguing arena in which to explore the challenges posed by the interplay of general relativity and quantum mechanics. One of the great successes of string theory has been the successful
explanation of Bekenstein-Hawking entropy formula (at least, for extremal and near-extremal black holes) in terms of statistical degeneracy associated with different brane configurations in string theory have been working in the area of black holes in string theory for past few years. In the past, I have worked on understanding the properties of black holes using and developing the tools in string theory. Currently I am interested in holographic dualities, in particular, non-relativistic holography and microstate geometry program for black holes. In addition, various interesting problems in classical general relativity (especially higher dimensional GR) like horizon smoothness and singularity analysis continue to interest me.
