Topological exceptional surfaces in non-Hermitian systems with parity-time and parity-particle-hole symmetries
By R. Okugawa, T. Yokoyama. Physical review B, 2018
169 citations recorded by the source corpus.
We study a topological band degeneracy in non-Hermitian systems with parity-time ($PT$) and parity-particle-hole ($CP$) symmetries. In $d$-dimensional non-Hermitian systems, it is shown that $(d-1)$-dimensional exceptional surfaces can appear from band touching thanks to $PT$ or $CP$ symmetry. We investigate the topological stability and zero-gap quasiparticles for the exceptional surfaces due to the band degeneracy. We also demonstrate the band degeneracy by using lattice models of a topological semimetal and a superconductor.
Subfields: Atomic and Molecular Physics, and Optics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/57c4f958f35524ced3d2484e357e0cdf255f62e5
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In Atomic and Molecular Physics, and Optics
In Statistical and Nonlinear Physics
Citations in the corpus
- Perspective on topological states of non-Hermitian lattices (2019, background): “Exceptional points may also acquire different flavors by becoming anisotropic [88], packing onto exceptional surfaces as reported by Okugawa and Yokoyama [89], exceptional”