Non-Bloch quench dynamics

TL;DR

This paper investigates the quench dynamics of non-Hermitian topological models with skin effects, revealing dynamic skyrmions linked to non-Bloch invariants, and proposes a scheme for their experimental detection.

Contribution

It introduces a non-Bloch band theory approach to analyze quench dynamics, uncovering dynamic skyrmions and their relation to non-Bloch topological invariants in non-Hermitian systems.

Findings

Dynamic skyrmions exist in the generalized momentum-time domain.

Skyrmions are linked to non-Bloch topological invariants.

Detection scheme works beyond fixed point conditions.

Abstract

We study the quench dynamics of non-Hermitian topological models with non-Hermitian skin effects. Adopting the non-Bloch band theory and projecting quench dynamics onto the generalized Brillouin zone, we find that emergent topological structures, in the form of dynamic skyrmions, exist in the generalized momentum-time domain, and are correlated with the non-Bloch topological invariants of the static Hamiltonians. The skyrmion structures anchor on the fixed points of dynamics whose existence are conditional on the coincidence of generalized Brillouin zones of the pre- and post-quench Hamiltonians. Global signatures of dynamic skyrmions, however, persist well beyond such a condition, thus offering a general dynamic detection scheme for non-Bloch topology in the presence of non-Hermitian skin effects. Applying our theory to an experimentally relevant, non-unitary quantum walk, we explicitly demonstrate how the non-Bloch topological invariants can be revealed through the non-Bloch quench dynamics.