Quantum geometrical effects in non-Hermitian systems

TL;DR

This paper investigates how quantum geometric concepts like adiabatic potentials and quantum metrics manifest in non-Hermitian systems, linking theoretical insights to measurable physical phenomena through numerical simulations.

Contribution

It establishes the connection between quantum geometry and observable effects in non-Hermitian systems, including the measurement of the non-Hermitian quantum metric.

Findings

Quantum geometry explains non-Hermitian system behavior.

Non-Hermitian quantum metric can be experimentally measured.

Numerical simulations validate theoretical predictions.

Abstract

We explore the relation between quantum geometry in non-Hermitian systems and physically measurable phenomena. We highlight various situations in which the behavior of a non-Hermitian system is best understood in terms of quantum geometry, namely the notion of adiabatic potentials in non-Hermitian systems and the localization of Wannier states in periodic non-Hermitian systems. Further, we show that the non-Hermitian quantum metric appears in the response of the system upon time-periodic modulation, which one can use to experimentally measure the non-Hermitian quantum metric. We validate our results by providing numerical simulations of concrete exemplary systems.