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Tuning commensurability in twisted van der Waals bilayers.

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Large-angle twisted transition metal dichalcogenide bilayers create novel moiré patterns, including quasicrystals and commensurate crystals. These structures exhibit unique electronic behaviors, opening new avenues in moiré physics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Moiré superlattices are typically formed in van der Waals bilayers at small twist angles, resulting in long-wavelength patterns with approximate translational symmetry.
  • At large twist angles, moiré patterns are generally incommensurate, with exceptions at specific discrete angles.

Purpose of the Study:

  • To investigate the distinct platforms offered by large-angle twisted bilayers.
  • To explore the creation and electronic properties of moiré patterns at large twist angles in tungsten diselenide bilayers.

Main Methods:

  • Fabrication of twisted tungsten diselenide bilayers with large twist angles.
  • Utilized valley-resolved scanning tunneling spectroscopy to probe electronic structures.

Main Results:

  • Successfully created incommensurate dodecagon quasicrystals at a twist angle of 30°.
  • Synthesized commensurate moiré crystals at twist angles of 21.8° and 38.2°.
  • Observed distinct electronic behaviors between moiré crystals and quasicrystals, including mini-gap formation in the K valley near the valence band maximum.

Conclusions:

  • Large-angle twisted bilayers provide a versatile platform for generating diverse moiré patterns, including quasicrystals.
  • These systems exhibit unique electronic properties, differing significantly from small-angle moiré structures.
  • This work expands the design space for exploring novel moiré physics beyond traditional small-angle regimes.