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All-optical materials design of chiral edge modes in transition-metal dichalcogenides

Author

Listed:
  • Martin Claassen

    (Stanford University
    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University)

  • Chunjing Jia

    (Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University)

  • Brian Moritz

    (Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
    University of North Dakota)

  • Thomas P. Devereaux

    (Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
    Geballe Laboratory for Advanced Materials, Stanford University)

Abstract

Monolayer transition-metal dichalcogenides are novel materials which at low energies constitute a condensed-matter realization of massive relativistic fermions in two dimensions. Here, we show that this picture breaks for optical pumping—instead, the added complexity of a realistic materials description leads to a new mechanism to optically induce topologically protected chiral edge modes, facilitating optically switchable conduction channels that are insensitive to disorder. In contrast to graphene and previously discussed toy models, the underlying mechanism relies on the intrinsic three-band nature of transition-metal dichalcogenide monolayers near the band edges. Photo-induced band inversions scale linearly in applied pump field and exhibit transitions from one to two chiral edge modes on sweeping from red to blue detuning. We develop an ab initio strategy to understand non-equilibrium Floquet–Bloch bands and topological transitions, and illustrate for WS2 that control of chiral edge modes can be dictated solely from symmetry principles and is not qualitatively sensitive to microscopic materials details.

Suggested Citation

  • Martin Claassen & Chunjing Jia & Brian Moritz & Thomas P. Devereaux, 2016. "All-optical materials design of chiral edge modes in transition-metal dichalcogenides," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13074
    DOI: 10.1038/ncomms13074
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    Cited by:

    1. Aaron J. Sternbach & Simone Latini & Sanghoon Chae & Hannes Hübener & Umberto Giovannini & Yinming Shao & Lin Xiong & Zhiyuan Sun & Norman Shi & Peter Kissin & Guang-Xin Ni & Daniel Rhodes & Brian Kim, 2020. "Femtosecond exciton dynamics in WSe2 optical waveguides," Nature Communications, Nature, vol. 11(1), pages 1-6, December.

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