Floquet Weyl semimetals in light-irradiated type-II and hybrid line-node semimetals

TL;DR

This paper explores how circularly polarized light can induce and control Floquet Weyl semimetal states in type-II and hybrid line-node semimetals, revealing tunable phase diagrams and distinct Hall conductivities.

Contribution

It demonstrates the induction of Floquet Weyl states in type-II and hybrid line-node semimetals and maps their phase diagrams under light irradiation, highlighting their tunability.

Findings

Two types of Floquet Weyl semimetals can be induced.

Phase diagrams are distinct from type-I LNSMs.

Different anomalous Hall conductivities characterize the Floquet states.

Abstract

Type-II Weyl semimetals have recently attracted intensive research interest because they host Lorentz-violating massless fermions as quasiparticles. The discovery of type-II Weyl semimetals evokes the study of type-II line-node semimetals (LNSMs) whose linear dispersion is strongly tilted near the nodal ring. We present here a study on the circularly polarized light-induced Floquet states in type-II LNSMs, as well as those in hybrid LNSMs that have a partially over-tilted linear dispersion in the vicinity of the nodal ring. We illustrate that two distinct types of Floquet Weyl semimetal (WSM) states can be induced in periodically driven type-II and hybrid LNSMs, and the type of Floquet WSMs can be tuned by the direction and intensity of the incident light. We construct phase diagrams of light irradiated type-II and hybrid LNSMs which are quite distinct from those of light-irradiated type-I LNSMs. Moreover, we show that the photoinduced Floquet type-I and type-II WSMs can be characterized by the emergence of different anomalous Hall conductivities.