Stable topological edge states in a non-Hermitian four-band model

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Yuce C.

PHYSICAL REVIEW A, vol.98, no.1, 2018 (SCI-Expanded, Scopus)

• Publication Type: Article / Article
• Volume: 98 Issue: 1
• Publication Date: 2018
• Doi Number: 10.1103/physreva.98.012111
• Journal Name: PHYSICAL REVIEW A
• Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Open Archive Collection: AVESIS Open Access Collection
• Anadolu University Affiliated: Yes

Abstract

We introduce a one-dimensional non-Hermitian four-band tight-binding lattice system. We find stable topological edge states protected by particle-hole and parity-time symmetries. We show that a topological phase appears in the system. We discuss that the system can also be used as a topological laser if the gain and loss positions in a unit cell are judiciously arranged.