Topological quantum walk with discrete time-glide symmetry

Ken Mochizuki, Takumi Bessho, Masatoshi Sato, Hideaki Obuse

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Discrete quantum walks are periodically driven systems with discrete time evolution. In contrast to ordinary Floquet systems, no microscopic Hamiltonian exists, and the one-period time evolution is given directly by a series of unitary operators. Regarding each constituent unitary operator as a discrete time step, we formulate discrete space-time symmetry in quantum walks and evaluate the corresponding symmetry protected topological phases. In particular, we study chiral and/or time-glide symmetric topological quantum walks in this formalism. Due to the discrete nature of time evolution, the topological classification is found to be different from that in conventional Floquet systems. As a concrete example, we study a two-dimensional quantum walk having both chiral and time-glide symmetries and identify the anomalous edge states protected by these symmetries.

Original languageEnglish
Article number035418
JournalPhysical Review B
Volume102
Issue number3
DOIs
Publication statusPublished - 2020 Jul 15
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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