6 papers
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,…
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…
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…