Floquet-Weyl semimetals generated by an optically resonant interband-transition

Abstract

Floquet-Weyl semimetals (FWSMs) generated by irradiation of a continuous-wave laser with left-hand circular polarization (rotating in counterclockwise sense with time) on the group II-V narrow gap semiconductor Zn${}_3$As${}_2$ are theoretically investigated, where the frequency of the laser is set nearly {\it resonant} with a band gap of the crystal. It is found that the excitation of the crystal by such a laser induce two types of FWSM phases that differ absolutely in characters. To be specific, the associated two pairs of Weyl points are stably formed by band touching between Floquet sidebands ascribable to a valence band labeled as $J_z=\pm 3/2$ and a conduction band labeled as $J_z=\pm 1/2$, where $J_z$ represents the $z$-component of total angular momentum quantum number of $\Gamma$-point and a double sign corresponds. Here, one FWSM state composed of the up-spin Floquet sidebands relevant to $J_z=3/2$ and $1/2$ shows almost quadratic band-touching in the vicinity of the associated pair of Weyl points, while the other FWSM state composed of the down-spin Floquet sidebands relevant to $J_z=-3/2$ and $-1/2$ shows linear band-touching. Further, it is revealed that both up-spin and down-spin sidebands host nontrivial two-dimensional surface states that are pinned to the respective pairs of the Weyl points. Both surface states also show different energy dispersions and physical properties. More detailed discussion is made in the text on the origin of the above findings, chirality of the FWSM phases, alteration of topological order, laser-induced magnetic properties, and so on.

20 pages, 7 figures

References in corpus (23)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Titanic Magnetoresistance in WTe2
• Photovoltaic Hall effect in graphene
• Topological characterization of periodically-driven quantum systems
• Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
• Reflection symmetric second-order topological insulators and superconductors
• Classification of stable three-dimensional Dirac semimetals with nontrivial topology
• Colloquium: Majorana Fermions in nuclear, particle and solid-state physics
• Chiral anomaly and transport in Weyl metals
• Chiral Anomaly and Diffusive Magnetotransport in Weyl Metals
• Tuning phase transition between quantum spin Hall and ordinary insulating phases
• Holographic Anomalous Conductivities and the Chiral Magnetic Effect
• Theory of photoinduced Floquet Weyl semimetal phases
• Photovoltaic anomalous Hall effect in line-node semimetals
• Inverse Faraday effect in graphene and Weyl semimetals
• Floquet-engineering of nodal rings and nodal spheres and their characterization using the quantum metric
• Axial Magnetoelectric Effect in Dirac semimetals
• Floquet and Anomalous Floquet Weyl Semimetals
• Two-dimensional Topological Semimetals Protected by Symmorphic Symmetries
• Dynamical characterization of Weyl nodes in Floquet Weyl semimetal phases
• Chiral Topological Excitons in a Chern Band Insulator
• Topological Inverse Faraday Effect in Weyl Semimetals
• Giant inverse Faraday effect in Dirac semimetals

Cited by in corpus (1)

• Laser induced surface magnetization in Floquet-Weyl semimetals