67 citations · 87 across the 9 of their papers we have counts for
9 papers
The Bott Metric: A Real-Space Bridge Between Topology and Quantum Metric
Kaustav Chatterjee, Ronika Sarkar, Md Afsar Reja +1
The Bott index has become an indispensable tool to probe the topology of quantum matter, particularly in systems lacking translational symmetry. Constructed from a plaquette operat…
Refraction-induced transverse charge transport
Ronika Sarkar, Arka Bandyopadhyay, Awadhesh Narayan +1
We introduce a mechanism that produces a Hall-like transverse response in time-reversal-invariant materials, driven entirely by geometric effects. Specifically, we demonstrate that…
Chiral damping with persistent edge states: interplay of spectral topology and band topology in open quantum systems
Ronika Sarkar, Suraj S. Hegde, Awadhesh Narayan +1
We study the dynamical consequences of combining the non-Hermitian skin effect with topological edge states. Focusing on the paradigmatic dissipative Hofstadter model, we find that…
Non-Hermitian Topology and Flat Bands via an Exact Real Space Decimation Scheme
Ayan Banerjee, Arka Bandyopadhyay, Ronika Sarkar +1
In recent years, non-Hermitian phases in classical and quantum systems have garnered significant attention. In particular, their intriguing band geometry offers a platform for expl…
Emergence of two-fold non-Hermitian spectral topology through synthetic spin engineering
Ronika Sarkar, Ayan Banerjee, Awadhesh Narayan
The union of topology and non-Hermiticity has led to the unveiling of many intriguing phenomena. We introduce a synthetic spin-engineered model belonging to symmetry class AI, whic…
Non-Hermitian Topological Phases: Principles and Prospects
Ayan Banerjee, Ronika Sarkar, Soumi Dey +1
The synergy between non-Hermitian concepts and topological ideas have led to very fruitful activity in the recent years. Their interplay has resulted in a wide variety of new non-H…
A new class of solutions to the van Dantzig problem, the Lee-Yang property, and the Riemann hypothesis
T. Konstantopoulos, P. Patie, R. Sarkar
The purpose of this paper is to carry out an in-depth analysis of the intriguing van Dantzig problem which consists on characterizing the set of analytic characteristi…
Non-Hermiticity induced Exceptional Points and Skin Effect in the Dice-Haldane Model
Ronika Sarkar, Arka Bandyopadhyay, Awadhesh Narayan
The interplay of topology and non-Hermiticity has led to diverse, exciting manifestations in a plethora of systems. In this work, we systematically investigate the role of non-Herm…
Interplay of Disorder and Point-Gap Topology: Chiral Modes, Localization and Non-Hermitian Anderson Skin Effect in One Dimension
Ronika Sarkar, Suraj S. Hegde, Awadhesh Narayan
Symmetry-protected spectral topology in non-Hermitian systems has interesting manifestations such as dynamically anomalous chiral currents and skin effect. We study the interplay b…