Emergent Weyl nodes and Fermi arcs in a Floquet Weyl semimetal

2016/12/05 by Leda Bucciantini, Sthitadhi Roy, Sota Kitamura +1 · 1 citation
Mathematics · Physics and Astronomy · #Band gap #Cold Atom Physics and Bose-Einstein Condensates #Fermi Gamma-ray Space Telescope #Floquet theory #Hamiltonian (control theory) #Lattice (music) #Magnetic monopole #Mathematics #Nonlinear system #Physics #Quantum Mechanics and Non-Hermitian Physics #Quantum mechanics #Semimetal #Topological Materials and Phenomena #Weyl semimetal #cond-mat.mes-hall #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.96.041126

published as Phys. Rev. B 96, 041126 (2017) · 4 pages, 5 figures + references + supplementary material

arxiv created 2016/12/05 · openalex publication_date 2017/07/27 · arxiv updated 2017/08/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

When a Dirac semimetal is subject to a circularly polarized laser, it is predicted that the Dirac cone splits into two Weyl nodes and a nonequilibrium transient state called the Floquet Weyl semimetal is realized. We focus on the previously unexplored low-frequency regime, where the upper and lower Dirac bands resonantly couple with each other through multiphoton processes, which is a realistic situation in solid-state ultrafast pump-probe experiments. We find a series of new Weyl nodes emerging in pairs when the Floquet replica bands hybridize with each other. The nature of the Floquet Weyl semimetal with regard to the number, locations, and monopole charges of these Weyl nodes is highly tunable with the amplitude and frequency of the light. We derive an effective low-energy theory using Brillouin-Wigner expansion and further regularize the theory on a cubic lattice. The monopole charges obtained from the low-energy Hamiltonian can be reconciled with the number of Fermi arcs on the lattice, which we find numerically.

Citations

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Cited by

• Photoinduced tunable anomalous Hall and Nernst effects in tilted Weyl semimetals using Floquet theory