AI Article Synopsis

  • The study investigates the presence of an electric field in twisted-bilayer molybdenum disulfide (MoS) and its connection to local polar domains using advanced imaging techniques and computational methods.
  • It uncovers the formation of in-plane topological vortices in structured patterns at different twist angles, particularly at small angles and a 30° twist, which generates intricate chiral vortex designs.
  • The research emphasizes that manipulating the twist in 2D bilayers opens up new possibilities for controlling electric polar vortices at a very small scale.

Article Abstract

We report the observation of an electric field in twisted-bilayer molybdenum disulfide (MoS) 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.

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http://dx.doi.org/10.1126/science.adp7099DOI Listing

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Article Synopsis
  • The study investigates the presence of an electric field in twisted-bilayer molybdenum disulfide (MoS) and its connection to local polar domains using advanced imaging techniques and computational methods.
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  • The research emphasizes that manipulating the twist in 2D bilayers opens up new possibilities for controlling electric polar vortices at a very small scale.
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