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Lattice reconstruction induced multiple ultra-flat bands in twisted bilayer WSe2

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  • En Li

    (The Hong Kong University of Science and Technology)

  • Jin-Xin Hu

    (The Hong Kong University of Science and Technology)

  • Xuemeng Feng

    (The Hong Kong University of Science and Technology)

  • Zishu Zhou

    (The Hong Kong University of Science and Technology)

  • Liheng An

    (The Hong Kong University of Science and Technology)

  • Kam Tuen Law

    (The Hong Kong University of Science and Technology)

  • Ning Wang

    (The Hong Kong University of Science and Technology)

  • Nian Lin

    (The Hong Kong University of Science and Technology)

Abstract

Moiré superlattices in van der Waals heterostructures provide a tunable platform to study emergent properties that are absent in the natural crystal form. Twisted bilayer transition metal dichalcogenides (TB-TMDs) can host moiré flat bands over a wide range of twist angles. For twist angle close to 60°, it was predicted that TB-TMDs undergo a lattice reconstruction which causes the formation of ultra-flat bands. Here, by using scanning tunneling microscopy and spectroscopy, we show the emergence of multiple ultra-flat bands in twisted bilayer WSe2 when the twist angle is within 3° of 60°. The ultra-flat bands are manifested as narrow tunneling conductance peaks with estimated bandwidth less than 10 meV, which is only a fraction of the estimated on-site Coulomb repulsion energy. The number of these ultra-flat bands and spatial distribution of the wavefunctions match well with the theoretical predictions, strongly evidencing that the observed ultra-flat bands are induced by lattice reconstruction. Our work provides a foundation for further study of the exotic correlated phases in TB-TMDs.

Suggested Citation

  • En Li & Jin-Xin Hu & Xuemeng Feng & Zishu Zhou & Liheng An & Kam Tuen Law & Ning Wang & Nian Lin, 2021. "Lattice reconstruction induced multiple ultra-flat bands in twisted bilayer WSe2," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25924-6
    DOI: 10.1038/s41467-021-25924-6
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