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Emergent Weyl nodes and Fermi arcs in a Floquet Weyl semimetal

Leda Bucciantini, Sthitadhi Roy, Sota Kitamura, and Takashi Oka
Phys. Rev. B 96, 041126(R) – Published 27 July 2017
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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.

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  • Received 13 December 2016
  • Revised 25 March 2017

DOI:https://doi.org/10.1103/PhysRevB.96.041126

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Leda Bucciantini1,2, Sthitadhi Roy1, Sota Kitamura3, and Takashi Oka1,2

  • 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany
  • 2Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
  • 3Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan

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Issue

Vol. 96, Iss. 4 — 15 July 2017

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