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Exceptional non-Hermitian topological edge mode and its application to active matter

Physics

Exceptional non-Hermitian topological edge mode and its application to active matter

K. Sone, Y. Ashida, et al.

Explore groundbreaking research by Kazuki Sone, Yuto Ashida, and Takahiro Sagawa that uncovers a universal mechanism for robust gapless edge modes in non-Hermitian systems. This innovative approach, involving exceptional points, ensures durability against disorder and applies to cutting-edge topological insulator lasers, offering new insights for scattering-free edge currents.

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Playback language: English
Abstract
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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