Five-dimensional Floquet topological semimetals with emergent Yang monopoles and linked Weyl surfaces

TL;DR

This paper explores how periodic driving induces novel topological phases in five-dimensional insulators, including Floquet topological semimetals with Yang monopoles and linked Weyl surfaces, advancing understanding of higher-dimensional Floquet systems.

Contribution

It demonstrates that time-periodic driving can induce topological phase transitions in 5D insulators, creating new Floquet topological semimetals with emergent Yang monopoles and linked Weyl surfaces.

Findings

Periodic driving induces 5D Floquet topological semimetals with Yang monopoles.

Driving causes topological phase transition to semimetals with linked Weyl surfaces.

Further driving transforms phases into 5D Floquet Chern insulators.

Abstract

Recently, Floquet topological matter has attracted significant attention for its potential to reveal novel topological phases inaccessible in static systems. In this paper, we investigate the effect of a time-periodic driving on the five-dimensional (5D) normal insulators. We show that the time-periodic driving can induce a topological phase transition from a \textbf{TP} (time reversal combined with space inversion) symmetry-preserving normal insulator to a 5D Floquet topological semimetal with emergent Yang monopoles characterized by the second Chern number. Additionally, we show that this time-periodic driving can also lead to a topological phase transition from a \textbf{TP} symmetry-breaking normal insulator to a 5D Floquet topological semimetal with a Hopf link formed by Weyl surfaces. Besides, further increasing the strength of the time-periodic driving, the two 5D Floquet topological semimetal phases are transformed into the 5D Floquet Chern insulators. Our paper is helpful for future studies in higher dimensional Floquet systems.