226 citations · 1.3k across the 43 of their papers we have counts for
16 papers · 1 filter
Entanglement entropy of fermions in a strange metal
Santanu Singh, Surajit Bera, Chenyuan Li +2
The subsystem-size dependence of ground-state entanglement entropy and its crossover to thermal entropy as a function of temperature are well understood for one-dimensional (1D) ga…
Tunable Chaos in the Finite Mean SYK Model
Arkaprava Mukherjee, Sumilan Banerjee, Sandip P. Trivedi +1
The complex Sachdev-Ye-Kitaev (SYK) model, featuring fermions with all-to-all interactions, serves as a dual paradigm for understanding non-Fermi liquid behavior and the holographi…
Universal non-equilibrium dynamics of pure states and density-dependent thermalization in Sachdev-Ye-Kitaev model
Rishik Perugu, Arijit Haldar, Sumilan Banerjee
Non-equilibrium dynamics of unentangled and entangled pure states in interacting quantum systems is crucial for harnessing quantum information and to understand quantum thermalizat…
Quantum fluctuations lead to glassy electron dynamics in the good metal regime of electron doped KTaO3
Shashank Kumar Ojha, Sankalpa Hazra, Surajit Bera +10
One of the central challenges in condensed matter physics is to comprehend systems that have strong disorder and strong interactions. In the strongly localized regime, their subtle…
Dynamical mean-field theory for Rényi entanglement entropy and mutual Information in Hubbard Model
Surajit Bera, Arijit Haldar, Sumilan Banerjee
Quantum entanglement, lacking any classical counterpart, provides a fundamental new route to characterize the quantum nature of many-body states. In this work, we discuss an implem…
Quantum Oscillations in the Magnetisation and Density of States of Insulators
Animesh Panda, Sumilan Banerjee, Mohit Randeria
The observation of -periodic behavior in Kondo insulators SmB and YbB challenges the conventional wisdom that quantum oscillations (QO) necessarily arise from Fermi…
Renyi entanglement entropy of Fermi liquids and non-Fermi liquids: Sachdev-Ye-Kitaev model and dynamical mean field theories
Arijit Haldar, Surajit Bera, Sumilan Banerjee
We present a new method for calculating Renyi entanglement entropies for fermionic field-theories originating from microscopic Hamiltonians. The method builds on an operator identi…
Quench, thermalization and residual entropy across a non-Fermi liquid to Fermi liquid transition
Arijit Haldar, Prosenjit Haldar, Surajit Bera +2
We study the thermalization, after sudden and slow quenches, of an interacting model having a quantum phase transition from a Sachdev-Ye-Kitaev (SYK) non-Fermi liquid (NFL) to a Fe…
High Temperature Superconductivity in the Cuprates: Materials, Phenomena and a Mechanism
Sumilan Banerjee, Chandan Dasgupta, Subroto Mukerjee +2
Superconductivity in the cuprates, discovered in the late 1980s and occurring at unprecedentedly high temperatures (up to about 140K) in about thirty chemically distinct families,…
Higher-dimensional SYK Non-Fermi Liquids at Lifshitz transitions
Arijit Haldar, Sumilan Banerjee, Vijay B. Shenoy
We address the key open problem of a higher dimensional generalization of the Sachdev-Ye-Kitaev (SYK) model. We construct a model on a lattice of SYK dots with non-random intersite…
Solvable model for a dynamical quantum phase transition from fast to slow scrambling
Sumilan Banerjee, Ehud Altman
We propose an extension of the Sachdev-Ye-Kitaev (SYK) model that exhibits a quantum phase transition from the previously identified non-Fermi liquid fixed point to a Fermi liquid…
Skyrmions in Chiral Magnets with Rashba and Dresselhaus Spin-Orbit Coupling
James Rowland, Sumilan Banerjee, Mohit Randeria
Skyrmions are topological spin textures of interest for fundamental science and applications. Previous theoretical studies have focused on systems with broken bulk inversion symmet…
Enhanced Stability of Skyrmions in Two-Dimensional Chiral Magnets with Rashba Spin-Orbit Coupling
Sumilan Banerjee, James Rowland, Onur Erten +1
Recent developments have led to an explosion of activity on skyrmions in three-dimensional (3D) chiral magnets. Experiments have directly probed these topological spin textures, re…
Ferromagnetic exchange, spin-orbit coupling and spiral magnetism at the LaAlO_3/SrTiO_3 interface
Sumilan Banerjee, Onur Erten, Mohit Randeria
The electronic properties of the polar interface between insulating oxides is a subject of great current interest. An exciting new development is the observation of robust magnetis…
Quantum oscillations in a d-wave vortex liquid
Sumilan Banerjee, Shizhong Zhang, Mohit Randeria
The observation of quantum oscillations in underdoped cuprates has generated intense debate about the nature of the field-induced resistive state and its implications for the `norm…
Pairing Fluctuations Determine Low Energy Electronic Spectra in Cuprate Superconductors
Sumilan Banerjee, T V Ramakrishnan, C Dasgupta
We describe here a minimal theory of tight binding electrons moving on the square planar Cu lattice of the hole-doped cuprates and mixed quantum mechanically with pairs of them (Co…