Resonant Edge-State Switching in Polariton Topological Insulators

Yiqi Zhang, Yaroslav V. Kartashov, Yanpeng Zhang, Lluis Torner, Dmitry V. Skryabin

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Topological insulators are unique devices supporting unidirectional edge states at their interfaces. Due to topological protection, such edge states persist in the presence of disorder and do not experience backscattering upon interaction with defects. Despite the topological protection and the fact that such states at the opposite edges of an insulator carry opposite currents, a physical mechanism exists allowing topological excitations propagating at opposite edges to be resonantly coupled. Such a mechanism uses weak periodic temporal modulations of the system parameters and does not affect the internal symmetry and topology of the system. This mechanism is illustrated in truncated honeycomb arrays of microcavity pillars, where topological insulation is possible for polaritons under the combined action of spin–orbit coupling and Zeeman splitting in the external magnetic field. The temporal modulation of the potential leads to a periodic switching between topological states with the same Bloch momentum, but located at the opposite edges. The switching rate is found to increase for narrower ribbon structures and for larger modulation depth, though it is changing nonmonotonically with the Bloch momentum of the input edge state. These results provide a promising realization of a coupling device based on topologically protected states.

Original languageEnglish
Article number1700348
JournalLaser and Photonics Reviews
Volume12
Issue number8
Early online date13 Jul 2008
DOIs
Publication statusPublished - 1 Aug 2018

Keywords

  • microcavities
  • optical switching devices
  • polaritons
  • self-action effects
  • topological insulators

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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