Electron Beam Manipulation on the Moiré Superlattice of Bilayer WS<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 41618118.
- Also identified by DOI 10.1021/acs.nanolett.5c05946.
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Abstract
The moiré superlattice in twisted transition metal dichalcogenides (TMDCs) offers a versatile platform for exploring electronic properties and correlated quantum phenomena. However, conventional fabrication methods using transfer and stacking techniques suffer from interfacial contamination and limited scalability. Here, we introduce an <i>in situ</i> focused electron beam irradiation approach to dynamically manipulate and characterize the moiré superlattice in bilayer 2<i>H</i>-WS<sub>2</sub> in TEM. We achieve real-time moiré pattern control, enabling precise twist angle adjustments (6-10°). Prolonged irradiation induces displacement of tungsten (W) and sulfur (S) atoms from the moiré superlattice, which migrate to heal vacancies in adjacent monolayers, ultimately collapsing the superlattice into a WS<sub>2</sub> monolayer and revealing an unexpected atomic-scale self-repair mechanism. This technique advances the study of twistronics in 2D quantum materials by providing a pathway for atomically precise engineering of moiré-driven electronic states while highlighting the potential of electron beam lithography (EBL) for the controllable fabrication of moiré devices.