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

En Li, Jin-Xin Hu, Xuemeng Feng, Zishu Zhou, Liheng An, Kam Tuen Law (), Ning Wang () and Nian Lin ()
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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

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-25924-6

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