39 citations · 99 across the 27 of their papers we have counts for
28 papers
Electron-phonon control of obstructed and quantum spin Hall topology in an altermagnet
Kuntal Bhattacharyya, Bilal Tanatar, Saurabh Basu
We theoretically demonstrate control over the interplay between obstructed atomic insulating and first-order topological phases via electron-phonon coupling (EPC) in a -wave alt…
Large nonlinear Hall effect in strained moiré structures hosting pseudospin-3/2 fermions
Srijata Lahiri, Gourab Paul, Bilal Tanatar +1
We investigate the linear and nonlinear Hall response of a moiré \emph{watermill lattice}, in which stacking and twisting generate a four-band manifold near the Fermi level with su…
Sector-resolved non-Bloch topology and nonlocal entanglement dynamics in a bond-dissipative Kitaev chain
Shaina Gandhi, Koustav Roy, Bilal Tanatar +1
A core characteristic of dissipative non-Hermitian topology is that the relaxation dynamics tracks the non-Bloch bulk-boundary correspondence, rendering an algebraic decay in the g…
Probing topological phase transitions via nonlinear Hall response in strained moiré dice lattice
Gourab Paul, Srijata Lahiri, Bilal Tanatar +1
Valley polarized twisted bilayer dice lattice hosts topologically nontrivial flat bands far from charge neutrality due to broken time reversal symmetry, whereas the ones in the vic…
Emergence of Non-Hermitian Magic Angles and Topological Phase Transitions in Twisted Bilayer - Lattices
Shaina Gandhi, Gourab Paul, Srijata Lahiri +1
We investigate the flat-band properties and topological phase transitions in a non-Hermitian twisted bilayer lattice. Here, non-Hermiticity is introduced via Hatano-Nelson-…
Second-order Skin Effect in a Brick-Wall Lattice
Dipendu Halder, Srijata Lahiri, Saurabh Basu
Non-Hermitian skin effect, which is a unique feature of non-Hermitian systems, exhibits the formation of an extensive number of boundary modes under open boundary conditions. Howev…
Floquet generation of hybrid-order topology and -like bipolar localization
Koustav Roy, Latu Kalita, Bilal Tanatar +1
Periodic driving offers a powerful tool to engineer topological phases and even induce phase transitions that are inaccessible in static settings. In this work, we demonstrate that…
Topological Magnons and Giant Orbital Nernst Effect in a Zigzag Kitaev Antiferromagnet
Shreya Debnath, Saurabh Basu
The exploration of topological and transport properties of collinear antiferromagnets and the role of Kitaev interactions in realising topological states therein have rarely been s…
Controlling Dissipative Topology Through Floquet Driving: From Transient Diagnostics to Boundary States Isolation
Koustav Roy, Shahroze Shahab, Saurabh Basu
Engineering dissipative dynamics in open quantum systems is under active focus, especially in topological settings where resilient edge modes are expected to exhibit decay rates di…
Emergent topology of flat bands in a twisted bilayer - lattice
Gourab Paul, Srijata Lahiri, Kuntal Bhattacharyya +1
We investigate an interesting interplay of destructive interference due to lattice geometry and band folding due to enlargement of the Brillouin zone in generating and subsequently…
Floquet Non-Bloch Formalism for a Non-Hermitian Ladder: From Theoretical Framework to Topolectrical Circuits
Koustav Roy, Dipendu Halder, Koustabh Gogoi +2
Periodically driven systems intertwined with non-Hermiticity opens a rich arena for topological phases that transcend conventional Hermitian limits. The physical significance of th…
Topological characterization of magnon-polaron bands and thermal Hall conductivity in a frustrated kagome antiferromagnet
Shreya Debnath, Kuntal Bhattacharyya, Saurabh Basu
Spin-phonon coupling and its efficacy in inducing multiple topological phase transitions in a frustrated kagome antiferromagnet have been rare in literature. To this end, we study…
Emergent topological phases and coexistence of gapless and spectral-localized Floquet quantum spin Hall states via electron-phonon interaction
Srijata Lahiri, Kuntal Bhattacharyya, Saurabh Basu
In this work, a thorough exploration has been carried out to unravel the role of electron-phonon interaction (EPI) in a Bernevig-Hughes-Zhang (BHZ) quantum spin Hall (QSH) insulato…
Floquet-engineered diode performance in a Majorana-quantum dot Josephson junction
Koustav Roy, Gourab Paul, Debika Debnath +2
We study nonreciprocal signatures of Josephson current (JC) in a quantum dot (QD)-based Josephson junction (JJ) that comprises of two periodically driven Kitaev chains (KCs) couple…
Controlled probing of localization effects in the non-Hermitian Aubry-André model via topolectrical circuits
Dipendu Halder, Saurabh Basu
Anderson localization and the non-Hermitian skin effect are two distinct confinement phenomena of the eigenfunctions that are driven, respectively, by disorder and nonreciprocity.…
Topological characterization of a non-Hermitian ladder via Floquet non-Bloch theory
Koustav Roy, Koustabh Gogoi, Saurabh Basu
In this paper, we study a non-Hermitian (NH) ladder subjected to a variety of driving protocols. The driven system looses chiral symmetry (CS) whose presence is indispensable for i…
Magnons on a dice lattice: topological features and transport properties
Shreya Debnath, Saurabh Basu
In this paper, we study the topological properties of magnons on a dice lattice, also known as the dual of a more widely studied kagome lattice. This structure has a central atom a…
Conductance properties of an - Corbino disk
Mijanur Islam, Saurabh Basu
In this work, we investigate an - lattice in the form of a Corbino disk, characterized by inner and outer radii and , threaded by a tunable magnetic flux. Throug…
Holstein polaron in a pseudospin- quantum spin Hall system: first and second order topological phase transitions
Kuntal Bhattacharyya, Srijata Lahiri, Mijanur Islam +1
We theoretically propose the occurrence of a quantum spin Hall (QSH) and a second order topological phase transition (TPT) driven by electron-phonon (e-p) coupling in a pseudospin-…
Quasiperiodic potential induced corner states in a quadrupolar insulator
Srijata Lahiri, Saurabh Basu
We systematically investigate the topological and localization properties of a quadrupolar insulator represented by the celebrated Benalcazar-Bernevig-Hughes model in presence of a…
Single and multi-frequency driving protocols in a Rashba nanowire proximitized to an s-wave superconductor
Koustav Roy, Saurabh Basu
We perform systematic analyses of single and multi-frequency driving protocols on a Rashba nanowire with superconducting correlations induced by proximity effects. The results for…
Electron-phonon coupling induced topological phase transition in an - Haldane-Holstein model
Mijanur Islam, Kuntal Bhattacharyya, Saurabh Basu
We present impelling evidence of topological phase transitions induced by electron-phonon (e-ph) coupling in an - Haldane-Holstein model that presents smooth tunability bet…
Competing topological phases in a non-Hermitian time-reversal symmetry-broken Bernevig-Hughes-Zhang model
Dipendu Halder, Srijata Lahiri, Saurabh Basu
The Bernevig-Hughes-Zhang (BHZ) model, which serves as a cornerstone in the study of the quantum spin Hall insulators, showcases robust spin-filtered helical edge states in a nanor…
Wannier charge center, spin resolved bulk polarization and corner modes in a strained quantum spin Hall insulator
Srijata Lahiri, Saurabh Basu
Topological invariants are a significant ingredient in the study of topological phases of matter that intertwines the supposedly contradicting concepts of bulk and boundary. The na…