Floquet topological phases with time-reversal and space inversion symmetries and dynamical detection of topological charges

TL;DR

This paper demonstrates how periodic driving can induce various topological insulator phases in four-band systems with spin-1/2 particles, establishing a link between topology and dynamics and proposing experimental detection methods.

Contribution

It introduces a method to realize multiple topological phases in a single system using periodic driving and connects these phases to observable dynamical signatures.

Findings

Realization of strong and second-order topological insulators via periodic driving.

Establishment of a direct link between topological properties and system dynamics.

Proposal of experimental detection schemes for these topological phases.

Abstract

For spinful systems with spin 1/2, it is generally believed that P and T invariant strong and second-order topologies exist in four band and eight band system, respectively. Here, by using periodic driving, we find it is possible to have strong topological insulator, second-order topological insulator and hybrid-order topological insulator in a single four band system. Furthermore, we established a direct connection between topology and dynamics. More convenient experimental detection for these topological phases has also been proposed. This study provides the theoretical basis for novel topological insulator that possess hybrid-order boundary states beyond the conventional regimes.