162 citations · 369 across the 37 of their papers we have counts for
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Higher order topological degeneracies and towards unique successive state-switching in a four-level open system
Sayan Bhattacherjee, Harsh K. Gandhi, Arnab Laha +1
The physics of topological singularities, namely exceptional points (EPs), has been a key to wide range of intriguing and unique physical effects in non-Hermitian systems. In this…
Nonlinearity Induced Anomalous Mode Collapsing and Non-chiral Asymmetric Mode Switching around multiple Exceptional Points
Sibnath Dey, Arnab Laha, Somnath Ghosh
The dynamical encirclement around a second order exceptional point (EP) and corresponding chirality driven nonadiabatic modal dynamics have attracted enormous attention in the topo…
Towards Hosting Bound State in Continuum in Specialty Optical Microcavity
Harsh K. Gandhi, Arnab Laha, Somnath Ghosh
We exploit the interaction between supported proximity resonances in an open non-uniformly pumped optical microcavity to host a Bound State in Continuum (BIC). Using the modeling o…
Exceptional Point and Toward Mode Selective Optical Isolation
Arnab Laha, Sibnath Dey, Harsh K. Gandhi +2
Dynamical encirclement of an Exceptional Point (EP) and corresponding time-asymmetric mode evolution properties due to breakdown in adiabatic theorem have been a key to range of ex…
Optical waveguide hosting multiple exceptional points: Toward selective mode conversion
Arnab Laha, Harsh K. Gandhi, Sibnath Dey +3
We investigate the astonishing physical aspects of Exceptional Points (EPs) in a 1D planar few-mode optical waveguide. The waveguide hosts four quasi-guided modes. Here interaction…
Benedicks-Amrein-Berthier theorem for the Heisenberg motion group and quaternion Heisenberg group
Somnath Ghosh, R. K. Srivastava
Since is a Gelfand pair, an exact analogue of the Heisenberg group result due to Narayanan and Ratnakumar is not possible for the Heisenberg motio…