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복잡계 이론물리 연구단
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Emergent localized states at the interface of a twofold PT -symmetric lattice

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Title
Emergent localized states at the interface of a twofold PT -symmetric lattice
Author(s)
Jung-Wan Ryu; Nojoon Myoung; Ara Go; Sungjong Woo; Sang-Jun Choi; Hee Chul Park
Publication Date
2020-07
Journal
Physical review research, v.2, no.3, pp.033149
Publisher
AMER PHYSICAL SOC
Abstract
ⓒAmerican Physical Society. We consider the role of nontriviality resulting from a non-Hermitian Hamiltonian without band topology that conserves twofold PT symmetry assembled by interconnections between a PT -symmetric lattice and its timereversal partner. Twofold PT symmetry in the lattice produces additional surface exceptional points that play the role of new critical points, along with the bulk exceptional point. We show that there are two distinct regimes possessing symmetry-protected localized states of which localization lengths are robust against non-Hermiticity parameter. The states are demonstrated by numerical calculation of a quasi-one-dimensional ladder lattice and a two-dimensional bilayered square lattice.
URI
https://pr.ibs.re.kr/handle/8788114/8928
DOI
: 10.1103/PhysRevResearch.2.033149
ISSN
2643-1564
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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