期刊
NANO LETTERS
卷 21, 期 7, 页码 3262-3270出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00563
关键词
Twisted 2D materials; Moire structures; Atomic reconstructions; Strain profiles; Interphase transitions; Scanning transmission electron microscopy
类别
资金
- Ministry of Education (MOE), Singapore under AcRF [MOE2018-T3-1-005]
- National Key R&D Program of China [2018YFA0305800]
- Natural Science Foundation of China [51622211]
- National University of Singapore
- MOE [MOE2017-T2-2-139]
- Singapore National Research Foundation, Prime Minister's Office [NRF-CRP16-2015-02]
- Presidential Postdoctoral Fellowship, Nanyang Technological University, Singapore [03INS000973C150]
Recent research has focused on twisting the angle between van der Waals stacked 2D layers to tune the physical properties of materials. Through advanced imaging techniques and theoretical calculations, new insights have been gained into the unique moire features and periodic lattice strain in commensurately twisted transition metal dichalcogenide (TMD) bilayers. These findings suggest that stacked variants in twisted bilayer systems exhibit similar electronic structures, indicating invariance against interlayer gliding.
Twisting the angle between van der Waals stacked 2D layers has recently sparked great interest as a new strategy to tune the physical properties of the materials. The twist angle and associated strain profiles govern the electrical and optical properties of the twisted 2D materials, but their detailed atomic structures remain elusive. Herein, using combined atomic-resolution electron microscopy and density functional theory (DFT) calculations, we identified five unique types of moire ' features in commensurately twisted root 7 a x root 7 a transition metal dichalcogenide (TMD) bilayers. These stacking variants are distinguishable only when the moire ' wavelength is short. Periodic lattice strain is observed in various commensurately twisted TMD bilayers. Assisted by Zernike polynomial as a hierarchical active-learning framework, a hexagon-shaped strain soliton network has been atomically unveiled in nearly commensurate twisted TMD bilayers. Unlike stacking-polytype-dependent properties in untwisted structures, the stacking variants have the same electronic structures that suggest twisted bilayer systems are invariant against interlayer gliding.
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