Polar and quasicrystal vortex observed in twisted-bilayer molybdenum disulfide

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Chi Shing Tsang
  • Xiaodong Zheng
  • Tong Yang
  • Zhangyuan Yan
  • Wei Han
  • Lok Wing Wong
  • Shu Ping Lau
  • Ming Yang
  • Jiong Zhao

Detail(s)

Original languageEnglish
Pages (from-to)198-205
Journal / PublicationScience
Volume386
Issue number6718
Online published10 Oct 2024
Publication statusPublished - 11 Oct 2024

Abstract

We report the observation of an electric field in twisted-bilayer molybdenum disulfide (MoS2) 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. © 2024 the authors, some rights reserved; exclusive licensee American Association for the Advancement of Science.

Citation Format(s)

Polar and quasicrystal vortex observed in twisted-bilayer molybdenum disulfide. / Tsang, Chi Shing; Zheng, Xiaodong; Yang, Tong et al.
In: Science, Vol. 386, No. 6718, 11.10.2024, p. 198-205.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review