Anomalous helical edge states in a non-Hermitian Chern insulator

By K. Kawabata, Ken Shiozaki, Masahito Ueda. Physical review B, 2018

138 citations recorded by the source corpus.

A non-Hermitian extension of a Chern insulator and its bulk-boundary correspondence are investigated. It is shown that in addition to the robust chiral edge states that reflect the nontrivial topology of the bulk (nonzero Chern number), anomalous helical edge states localized only at one edge can appear, which are unique to the non-Hermitian Chern insulator.

Subfields: Atomic and Molecular Physics, and Optics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/65b75bb2ca29627c0bd1c6dde7d9e6757220585b

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In Atomic and Molecular Physics, and Optics

1. Nathan Goldman
2. A. Amo
3. T. Ozawa
4. Flore K. Kunst
5. H. Price
6. J. C. Budich
7. M. Rechtsman
8. I. Carusotto

In Statistical and Nonlinear Physics

1. Flore K. Kunst
2. Pedro Ribeiro
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4. Xiujuan Zhang
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6. E. Bergholtz
7. A. Amo
8. Tian Zhang

Citations in the corpus

• Higher-order non-Hermitian skin effect (2020, unknown): “[48] K.”
• A review on non-Hermitian skin effect (2022, methodology): “Some typical signatures include the localizations for an extensive number of bulk states, the breakdown of the conventional BBC and the defectiveness of the edge modes.”
• Interplay of non-Hermitian skin effects and Anderson localization in nonreciprocal quasiperiodic lattices (2019, background): “Especially, the non-Hermitian topology is attracting special attention for the violation of the conventional bulk-boundary correspondence of Hermitian topological systems, and new ways of topological characterization are needed [39–62].”
• Non-Hermitian systems and topology: A transfer-matrix perspective (2018, methodology): “We consider a non-Hermitian generalization of the twodimensional Chern insulator [50, 56, 57], for which we take”
• Topological photonics (2018, background): “…2011), and what is its relevance to bulk-edge correspondence (some recent progress has been made in this direction) (Lee, 2016; Leykam et al., 2017; Weimann et al., 2017; Kawabata, Shiozaki, and Ueda, 2018; Shen, Zhen, and Fu, 2018; Yao, Song, and Wang, 2018; Yao and Wang, 2018; Yin et al., 2018)?”
• Symmetry-protected nodal phases in non-Hermitian systems (2018, background): “Very recently, intense theoretical [7–37] and experimental [38–45] efforts have been made to extend the concept of topological band structures to non-Hermitian (NH) systems which play an important role in the effective description of dissipation effects in various physi-”
• Complex Spacing Ratios: A Signature of Dissipative Quantum Chaos (2019, background): “[23] K.”