39 citations · 247 across the 19 of their papers we have counts for
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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…
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…
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…
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…
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…
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…
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…