Non-Hermitian band topology with generalized inversion symmetry

Ryo Okugawa, Ryo Takahashi, Kazuki Yokomizo

研究成果: Article査読

6 被引用数 (Scopus)

抄録

Non-Hermitian skin effects and exceptional points are topological phenomena characterized by integer winding numbers. In this study, we give methods to theoretically detect skin effects and exceptional points by generalizing inversion symmetry. The generalization of inversion symmetry is unique to non-Hermitian systems. We show that parities of the winding numbers can be determined from energy eigenvalues on the inversion-invariant momenta when generalized inversion symmetry is present. The simple expressions for the winding numbers allow us to easily analyze skin effects and exceptional points in non-Hermitian bands. We also demonstrate the methods for (second-order) skin effects and exceptional points by using lattice models.

本文言語English
論文番号205205
ジャーナルPhysical Review B
103
20
DOI
出版ステータスPublished - 2021 5 21

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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