Crossover between rigid and reconstructed moiré lattice in h -BN-encapsulated twisted bilayer WSe 2 with different twist angles.

Autor: Kinoshita K; Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan. kkino@iis.u-tokyo.ac.jp., Lin YC; National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba 305-8565, Japan., Moriya R; Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan. kkino@iis.u-tokyo.ac.jp., Okazaki S; Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, Kanagawa 226-8501, Japan., Onodera M; Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan. kkino@iis.u-tokyo.ac.jp., Zhang Y; Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan. kkino@iis.u-tokyo.ac.jp., Senga R; National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba 305-8565, Japan., Watanabe K; Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan., Taniguchi T; Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan., Sasagawa T; Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, Kanagawa 226-8501, Japan., Suenaga K; The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan., Machida T; Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan. kkino@iis.u-tokyo.ac.jp.
Jazyk: angličtina
Zdroj: Nanoscale [Nanoscale] 2024 Aug 07; Vol. 16 (30), pp. 14358-14365. Date of Electronic Publication: 2024 Aug 07.
DOI: 10.1039/d4nr01863j
Abstrakt: A moiré lattice in a twisted-bilayer transition metal dichalcogenide (tBL-TMD) exhibits a complex atomic reconstruction effect when its twist angle is less than a few degrees. The influence of the atomic reconstruction on material properties of the tBL-TMD has been of particular interest. In this study, we performed scanning transmission electron microscopy (STEM) imaging of a moiré lattice in h -BN-encapsulated twisted bilayer WSe 2 with various twist angles. Atomic-resolution imaging of the moiré lattice revealed a reconstructed moiré lattice below a crossover twist angle of ∼4° and a rigid moiré lattice above this angle. Our findings indicate that h -BN encapsulation has a considerable influence on lattice reconstruction, as the crossover twist angle was larger in h -BN-encapsulated devices compared to non-encapsulated devices. We believe that this difference is due to the improved flatness and uniformity of the twisted bilayers with h -BN encapsulation. Our results provide a foundation for a deeper understanding of the lattice reconstruction in twisted TMD materials with h -BN encapsulation.
Databáze: MEDLINE
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