This paper reveals a ubiquitous mechanism for robust gapless edge modes in non-Hermitian systems, independent of bulk topology. These modes, protected by exceptional points (EPs) where eigenvectors coalesce, are robust against disorder and applicable to topological insulator lasers. Numerical confirmations in lattice models and a chiral active matter model demonstrate this mechanism, offering an alternative design principle for scattering-free edge currents in non-Hermitian devices.
Publisher
Nature Communications
Published On
Nov 12, 2020
Authors
Kazuki Sone, Yuto Ashida, Takahiro Sagawa
Tags
non-Hermitian systems
gapless edge modes
exceptional points
topological insulator lasers
scattering-free edge currents
disorder robustness
lattice models
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