Emergent localized states at the interface of a twofold PT-symmetric lattice
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 time-reversal partner. Twofold PT symmetry in the lattice produces additional surface excepti...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-07-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.033149 |
| _version_ | 1797211338318020608 |
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| author | Jung-Wan Ryu Nojoon Myoung Ara Go Sungjong Woo Sang-Jun Choi Hee Chul Park |
| author_facet | Jung-Wan Ryu Nojoon Myoung Ara Go Sungjong Woo Sang-Jun Choi Hee Chul Park |
| author_sort | Jung-Wan Ryu |
| collection | DOAJ |
| description | 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 time-reversal 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. |
| first_indexed | 2024-04-24T10:24:54Z |
| format | Article |
| id | doaj.art-74e1d87118ff4874995ba03d9238d4ae |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:24:54Z |
| publishDate | 2020-07-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-74e1d87118ff4874995ba03d9238d4ae2024-04-12T16:57:51ZengAmerican Physical SocietyPhysical Review Research2643-15642020-07-012303314910.1103/PhysRevResearch.2.033149Emergent localized states at the interface of a twofold PT-symmetric latticeJung-Wan RyuNojoon MyoungAra GoSungjong WooSang-Jun ChoiHee Chul ParkWe 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 time-reversal 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.http://doi.org/10.1103/PhysRevResearch.2.033149 |
| spellingShingle | Jung-Wan Ryu Nojoon Myoung Ara Go Sungjong Woo Sang-Jun Choi Hee Chul Park Emergent localized states at the interface of a twofold PT-symmetric lattice Physical Review Research |
| title | Emergent localized states at the interface of a twofold PT-symmetric lattice |
| title_full | Emergent localized states at the interface of a twofold PT-symmetric lattice |
| title_fullStr | Emergent localized states at the interface of a twofold PT-symmetric lattice |
| title_full_unstemmed | Emergent localized states at the interface of a twofold PT-symmetric lattice |
| title_short | Emergent localized states at the interface of a twofold PT-symmetric lattice |
| title_sort | emergent localized states at the interface of a twofold pt symmetric lattice |
| url | http://doi.org/10.1103/PhysRevResearch.2.033149 |
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