PT symmetric Floquet topological phase in SSH model

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Turker Z., Tombuloglu S., Yuce C.

PHYSICS LETTERS A, vol.382, no.30, pp.2013-2016, 2018 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 382 Issue: 30
  • Publication Date: 2018
  • Doi Number: 10.1016/j.physleta.2018.05.015
  • Journal Name: PHYSICS LETTERS A
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2013-2016
  • Keywords: Topological insulating phase, Floquet topological phase, PT symmetry, Non-Hermitian Hamiltonians
  • Anadolu University Affiliated: Yes

Abstract

We consider periodically modulated Su-Schrieffer-Heeger (SSH) model with gain and loss. This model, which can be realized with current technology in photonics using waveguides, allows us to study Floquet topological insulating phase. By using Floquet theory, we find the quasi-energy spectrum of this one dimensional PT symmetric topological insulator. We show that stable Floquet topological phase exists in our model provided that oscillation frequency is large and the non-Hermitian degree is below than a critical value. (C) 2018 Elsevier B.V. All rights reserved.