3 papers
cond-mat.dis-nn2026
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…
cond-mat.mes-hall2025
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…
cond-mat.mes-hall2025
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…