39 citations · 247 across the 19 of their papers we have counts for
19 papers
Stretched-Exponential Melting of a Dynamically Frozen State Under Imprinted Phase Noise in the Ising Chain in a Transverse Field
Krishanu Roychowdhury, Arnab Das
Dynamical freezing is a phenomenon where a set of local observables emerges as approximate but stable conserved quantities (freezes) under a strong periodic drive in a closed quant…
Volkov-Pankratov states on the edge of a quantum spin Hall system
Vivekananda Adak, Subhadeep Chakraborty, Krishanu Roychowdhury +1
Volkov-Pankratov (VP) states are a family of sub-gap states which appear at the smooth interface/domain wall between topologically distinct gapped states. We study the emergence of…
Supersymmetry on the lattice: Geometry, Topology, and Flat Bands
Krishanu Roychowdhury, Jan Attig, Simon Trebst +1
In quantum mechanics, supersymmetry (SUSY) posits an equivalence between two elementary degrees of freedom, bosons, and fermions defined by local rules. Here we apply it to find co…
Effects of surface potentials on Goos-Haenchen and Imbert-Fedorov shifts in Weyl semimetals
Ninad Kailas Dongre, Krishanu Roychowdhury
Weyl semimetals exhibit exotic transport responses, among which, recently Goos-Haenchen (GH) and Imbert-Fedorov (IF) effects have received a revived attention, which are, otherwise…
Topology in non-linear mechanical systems
Po-Wei Lo, Krishanu Roychowdhury, Bryan Gin-ge Chen +3
Many advancements have been made in the field of topological mechanics. The majority of the works, however, concerns the topological invariant in a linear theory. We, in this work,…
Spin-polarized voltage probes for helical edge state: a model study
Vivekananda Adak, Krishanu Roychowdhury, Sourin Das
Theoretical models of a spin-polarized voltage probe (SPVP) tunnel-coupled to the helical edge states (HES) of a quantum spin Hall system (QSHS) are studied. Our first model of the…
Entanglement dualities in supersymmetry
Robert H. Jonsson, Lucas Hackl, Krishanu Roychowdhury
We derive a general relation between the bosonic and fermionic entanglement in the ground states of supersymmetric quadratic Hamiltonians. For this, we construct canonical identifi…
Dynamics and correlations at a quantum phase transition beyond Kibble-Zurek
Krishanu Roychowdhury, Roderich Moessner, Arnab Das
Kibble-Zurek theory (KZ) stands out as the most robust theory of defect generation in the dynamics of phase transitions. KZ utilizes the structure of equilibrium states away from t…
Spin Berry phase in a helical edge state: Sz nonconservation and transport signatures
Vivekananda Adak, Krishanu Roychowdhury, Sourin Das
Topological protection of edge state in quantum spin Hall systems relies only on time-reversal symmetry. Hence, S z conservation on the edge can be relaxed which can have an interf…
Topological Mechanics from Supersymmetry
Jan Attig, Krishanu Roychowdhury, Michael J. Lawler +1
In topological mechanics, the identification of a mechanical system's rigidity matrix with an electronic tight-binding model allows to infer topological properties of the mechanica…
A classification of magnetic frustration and metamaterials from topology
Krishanu Roychowdhury, Michael J. Lawler
We study the relationship between the physics of topology and zero modes in frustrated systems and metama- terials. Zero modes that exist in topological matters are distinct from t…
Tunable multi-electron Pancharatnam phase in intensity interferometry
Disha Wadhawan, Krishanu Roychowdhury, Poonam Mehta +1
Pancharatnam phase was discovered in the context of polarization optics in nineteen fifties. However, its full realization in quantum many-body systems still eludes us. This is pri…
Topology and geometry of spin origami
Krishanu Roychowdhury, D. Zeb Rocklin, Michael J. Lawler
Kagome antiferromagnets are known to be highly frustrated and degenerate when they possess simple, isotropic interactions. We consider the entire class of these magnets when their…
Quantum Hall realization of polarized intensity interferometry
Krishanu Roychowdhury, Disha Wadhawan, Poonam Mehta +2
We combine the ideas of intensity interferometry, polarization optics and Bell's measurement into an experimental proposal which is hosted in a = quantum Hall (QH) edge s…
Doping effects on the magnetic frustration in the honeycomb iridates
Sujit Das, Er Jia Guo, Krishanu Roychowdhury
We investigate the doping effects of magnetic and nonmagnetic impurities injected to the honeycomb iridate sample of Na2IrO3 . Both the doping result in changing the ordering tempe…
Z2 topological liquid of hard-core bosons on a kagome lattice at 1/3 filling
Krishanu Roychowdhury, Subhro Bhattacharjee, Frank Pollmann
We consider hard-core bosons on the kagome lattice in the presence of short range repulsive interactions and focus particularly on the filling factor 1/3. In the strongly interacti…
Pseudospin-valve effect on transport in junctions of three-dimensional topological insulator surfaces
Sthitadhi Roy, Krishanu Roychowdhury, Sourin Das
We show that the surface states of pristine 3D topological insulators (TIs) are analogs of ferromagnetic half metals due to complete polarization of an emergent momentum independen…
Tensor renormalization group approach to classical dimer models
Krishanu Roychowdhury, Ching-Yu Huang
We analyze classical dimer models on the square and triangular lattice using a tensor network representation of the dimers. The correlation functions are numerically calculated usi…
Interplay of charge and spin fluctuations of strongly interacting electrons on the kagome lattice
Frank Pollmann, Krishanu Roychowdhury, Chisa Hotta +1
We study electrons hopping on a kagome lattice at third filling described by an extended Hubbard Hamiltonian with on-site and nearest-neighbour repulsions in the strongly correlate…