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Robustness of symmetry-protected topological states against time-periodic perturbations

Journal article
Authors Oleksandr Balabanov
Henrik Johannesson
Published in Physical Review B
Volume 96
Issue 3
ISSN 2469-9950
Publication year 2017
Published at Department of Physics (GU)
Language English
Links https://doi.org/10.1103/PhysRevB.96...
Keywords many-body localization, optical lattice, ultracold gases, insulators, polyacetylene, solitons, system, atoms, superconductors, fermions, Physics
Subject categories Physical Sciences

Abstract

The existence of gapless boundary states is a key attribute of any topological insulator. Topological band theory predicts that these states are robust against static perturbations that preserve the relevant symmetries. In this article, using Floquet theory, we examine how chiral symmetry protection extends also to states subject to time-periodic perturbations-in one-dimensional Floquet topological insulators as well as in ordinary one-dimensional time-independent topological insulators. It is found that, in the case of the latter, the edge modes are resistant to a much larger class of time-periodic symmetry-preserving perturbations than in Floquet topological insulators. Notably, boundary states in chiral time-independent topological insulators also exhibit an unexpected resilience against a certain type of symmetry-breaking time-periodic perturbations. We argue that this is a generic property for topological phases protected by chiral symmetry. Implications for experiments are discussed.

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