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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Twisted graphene bilayers create flat bands, leading to strongly correlated electronic states.
  • Precise interlayer arrangement is crucial for this physics.

Purpose of the Study:

  • To investigate the dominant factor shaping flat bands in twisted graphene bilayers.
  • To differentiate the roles of twist and heterostrain in forming correlated electronic states.

Main Methods:

  • Survey of published scanning tunneling microscope (STM) measurements.
  • Analysis of data near the magic-angle in twisted graphene bilayers.

Main Results:

  • Native heterostrain, not twist, is proven to dominate flat band formation near the magic-angle.
  • Tip-induced strain significantly influences flat bands at full filling.
  • Electronic correlations renormalize flat bands differently at zero doping based on experimental details.

Conclusions:

  • Heterostrain is a key factor in engineering flat bands and correlated states in twisted graphene.
  • Experimental conditions, including strain and doping, critically affect electronic properties.