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Interlayer Decoupling in 30° Twisted Bilayer Graphene Quasicrystal.

Bing Deng1, Binbin Wang2, Ning Li3,4

  • 1Center for Nanochemistry (CNC), Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China.

ACS Nano
|January 22, 2020
PubMed
Summary

We precisely controlled the stacking of twisted bilayer graphene (BLG) using a two-step epitaxial growth method. This revealed decoupled electronic states and linear dispersion in 30°-twisted BLG, offering insights into interlayer coupling.

Keywords:
electronic structureepitaxial growthinterlayer couplingquasicrystaltwisted bilayer graphene

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Stacking order critically influences the interlayer coupling and physical properties of twisted bilayer graphene (BLG).
  • Controlling the atomic-scale structure of BLG is essential for understanding its electronic behavior.

Purpose of the Study:

  • To investigate the interlayer coupling and electronic properties of epitaxially grown single-crystal 30°-twisted bilayer graphene (30°-tBLG) on Cu(111).
  • To establish a controlled synthesis method for twist-angle-defined BLG.

Main Methods:

  • A two-step epitaxial growth process involving thermodynamically controlled nucleation and kinetically controlled growth.
  • Atomic-scale characterization using scanning tunneling microscopy (STM) and spectroscopy (STS).
  • In situ electrostatic doping to probe energy-dependent local density of states.

Main Results:

  • The 30°-tBLG exhibits a quasicrystal-like symmetry.
  • Electronic states in the two graphene layers are decoupled near the Dirac point.
  • Linear electronic dispersion, characteristic of individual graphene monolayers with doubled degeneracy, was observed.

Conclusions:

  • The study demonstrates a method for controlled growth of specific twist-angle BLG.
  • The findings provide crucial insights into the decoupled electronic states and interlayer coupling in 30°-tBLG.
  • This work advances the understanding of van der Waals heterostructures and their electronic properties.