Polar and quasicrystal vortex observed in twisted-bilayer molybdenum disulfide
We report the observation of an electric field in twisted-bilayer molybdenum disulfide (MoS<sub>2</sub>) and elucidate its correlation with local polar domains using four-dimensional scanning transmission electron microscopy (4D-STEM) and first-principles calculations. We reveal the emergence of in-plane topological vortices within the periodic moiré patterns for both commensurate structures at small twist angles and the incommensurate quasicrystal structure that occurs at a 30° twist. The large-angle twist leads to mosaic chiral vortex patterns with tunable characteristics. A twisted quasicrystal bilayer, characterized by its 12-fold rotational symmetry, hosts complex vortex patterns and can be manipulated by picometer-scale interlayer displacement. Our findings highlight that twisting 2D bilayers is a versatile strategy for tailoring local electric polar vortices.
Authors
- Chun‐Sing Lee (ORCID: https://orcid.org/0000-0001-6557-453X)
- Tong Yang (ORCID: https://orcid.org/0000-0003-1474-1515)
- Shu Ping Lau (ORCID: https://orcid.org/0000-0002-5315-8472)
- Lok Wing Wong (ORCID: https://orcid.org/0000-0003-0014-4568)
- Xiaodong Zheng (ORCID: https://orcid.org/0000-0002-2642-1837)
- Zhangyuan Yan (ORCID: https://orcid.org/0000-0002-9094-363X)
- Thuc Hue Ly (ORCID: https://orcid.org/0000-0001-7852-3811)
- Ming Yang (ORCID: https://orcid.org/0000-0002-0876-1221)
- Wei Han
- Jiong Xin Zhao (ORCID: https://orcid.org/0000-0002-7411-0734)
- Haijun Liu (ORCID: https://orcid.org/0000-0001-5671-1598)
- Shan Gao (ORCID: https://orcid.org/0000-0001-9529-589X)
- Ka Ho Leung (ORCID: https://orcid.org/0000-0001-7080-0423)
- Chi Shing Tsang (ORCID: https://orcid.org/0000-0002-2762-8784)
Institutions
- Hong Kong Polytechnic University (HK)
- City University of Hong Kong (HK)
- Shenzhen Polytechnic University (CN)
- City University of Hong Kong, Shenzhen Research Institute (CN)
Publication Details
- Journal
- Science
- Published
- 2024-10-10
- DOI
- https://doi.org/10.1126/science.adp7099
- Citations
- 42
- Primary Topic
- Chalcogenide Semiconductor Thin Films
- Type
- article
- Field-Weighted Citation Impact
- 8.76