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Chiral metals and entrapped insulators in a one-dimensional topological non-Hermitian system

Banerjee, A and Hegde, SS and Agarwala, A and Narayan, A (2022) Chiral metals and entrapped insulators in a one-dimensional topological non-Hermitian system. In: Physical Review B, 105 (20).

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Official URL: https://doi.org/10.1103/PhysRevB.105.205403


In this work, we study many-body "steady states"that arise in the non-Hermitian generalization of the noninteracting Su-Schrieffer-Heeger model at a finite density of fermions. We find that the hitherto known phase diagrams for this system, derived from the single-particle gap closings, in fact correspond to distinct nonequilibrium phases, which either carry finite currents or are dynamical insulators where particles are entrapped. Each of these have distinct quasiparticle excitations and steady-state correlations and entanglement properties. Looking at finite-sized systems, we further modulate the boundary to uncover the topological features in such steady states, particularly the emergence of leaky boundary modes. Using a variety of analytical and numerical methods, we develop a theoretical understanding of the various phases and their transitions, and we uncover the rich interplay of nonequilibrium many-body physics, quantum entanglement, and topology in a simple looking yet rich model system.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Numerical methods; Topology, Chiral metal; Finite density; Generalisation; Hermitians; Many body; Noninteracting; One-dimensional; Single-particle gaps; Steady state; Su Schrieffer Heeger model, Quantum entanglement
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 16 Sep 2022 09:01
Last Modified: 16 Sep 2022 09:01
URI: https://eprints.iisc.ac.in/id/eprint/76546

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