Topological exceptional surfaces in non-Hermitian systems with parity-time and parity-particle-hole symmetries

Ryo Okugawa; Takehito Yokoyama

doi:10.1103/PhysRevB.99.041202

Topological exceptional surfaces in non-Hermitian systems with parity-time and parity-particle-hole symmetries

Ryo Okugawa, Takehito Yokoyama

Advanced Institute for Materials Research (AIMR)

Research output: Contribution to journal › Article › peer-review

68 Citations (Scopus)

Abstract

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.

Original language	English
Article number	041202
Journal	Physical Review B
Volume	99
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevB.99.041202
Publication status	Published - 2019 Jan 24

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.99.041202

Fingerprint Dive into the research topics of 'Topological exceptional surfaces in non-Hermitian systems with parity-time and parity-particle-hole symmetries'. Together they form a unique fingerprint.

Cite this

@article{7a7bc867ba3a4f7b833401811c9e0660,

title = "Topological exceptional surfaces in non-Hermitian systems with parity-time and parity-particle-hole symmetries",

abstract = "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.",

author = "Ryo Okugawa and Takehito Yokoyama",

note = "Funding Information: This work was supported by World Premier International Reserach Center Initiative (WPI), MEXT, Japan, JPSJ Grant-in-Aid Scientific Research on Innovative Areas “Discrete Geometric Analysis for Materials Design” (Grant No. 17H06460) and “Nano Spin Conversion Science” (Grant No. JP17H05179), and the JSPS-EPSRC Core-to-Core program “Oxide Superspin.”",

year = "2019",

month = jan,

day = "24",

doi = "10.1103/PhysRevB.99.041202",

language = "English",

volume = "99",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "4",

}

TY - JOUR

T1 - Topological exceptional surfaces in non-Hermitian systems with parity-time and parity-particle-hole symmetries

AU - Okugawa, Ryo

AU - Yokoyama, Takehito

N1 - Funding Information: This work was supported by World Premier International Reserach Center Initiative (WPI), MEXT, Japan, JPSJ Grant-in-Aid Scientific Research on Innovative Areas “Discrete Geometric Analysis for Materials Design” (Grant No. 17H06460) and “Nano Spin Conversion Science” (Grant No. JP17H05179), and the JSPS-EPSRC Core-to-Core program “Oxide Superspin.”

PY - 2019/1/24

Y1 - 2019/1/24

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85060870965&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85060870965&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.99.041202

DO - 10.1103/PhysRevB.99.041202

M3 - Article

AN - SCOPUS:85060870965

VL - 99

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 4

M1 - 041202

ER -