PT symmetric Floquet topological phase in SSH model

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Turker Z., Tombuloglu S., Yuce C.

PHYSICS LETTERS A, cilt.382, sa.30, ss.2013-2016, 2018 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 382 Sayı: 30
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.physleta.2018.05.015
  • Dergi Adı: PHYSICS LETTERS A
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2013-2016
  • Anahtar Kelimeler: Topological insulating phase, Floquet topological phase, PT symmetry, Non-Hermitian Hamiltonians
  • Anadolu Üniversitesi Adresli: Evet

Özet

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.