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  Emergent Weyl nodes and Fermi arcs in a Floquet Weyl semimetal

Bucciantini, L., Roy, S., Kitamura, S., & Oka, T. (2017). Emergent Weyl nodes and Fermi arcs in a Floquet Weyl semimetal. Physical Review B, 96(4): 041126, pp. 1-7. doi:10.1103/PhysRevB.96.041126.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-CA76-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-CFF7-9
Genre: Journal Article

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Bucciantini, Leda1, Author              
Roy, Sthitadhi2, Author
Kitamura, Sota2, Author
Oka, Takashi1, Author              
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              

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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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Language(s): eng - English
 Dates: 2017-07-272017-07-27
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 96 (4) Sequence Number: 041126 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008