Item request has been placed! ×
Item request cannot be made. ×
loading  Processing Request

Non-Hermitian Floquet Phases with Even-Integer Topological Invariants in a Periodically Quenched Two-Leg Ladder

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
  • معلومة اضافية
    • الموضوع:
      2020
    • نبذة مختصرة :
      Periodically driven non-Hermitian systems could possess exotic nonequilibrium phases with unique topological, dynamical, and transport properties. In this work, we introduce an experimentally realizable two-leg ladder model subjecting to both time-periodic quenches and non-Hermitian effects, which belongs to an extended CII symmetry class. Due to the interplay between drivings and nonreciprocity, rich non-Hermitian Floquet topological phases emerge in the system, with each of them characterized by a pair of even-integer topological invariants ( w 0 , w &pi
      ) &isin
      2 Z ×
      2 Z . Under the open boundary condition, these invariants further predict the number of zero- and &pi
      quasienergy modes localized around the edges of the system. We finally construct a generalized version of the mean chiral displacement, which could be employed as a dynamical probe to the topological invariants of non-Hermitian Floquet phases in the CII symmetry class. Our work thus introduces a new type of non-Hermitian Floquet topological matter, and further reveals the richness of topology and dynamics in driven open systems.
    • File Description:
      application/pdf
    • ISSN:
      1099-4300
    • Rights:
      OPEN
    • الرقم المعرف:
      edsair.doi.dedup.....999d879df8b93c4f3a9f6d9031ddeb60