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Disorder-dominated quantum criticality in moiré bilayers.

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Moiré bilayer materials exhibit metal-insulator transitions (MITs) driven by disorder, not just strong correlations. A new model explains these transitions and their quantum criticality observed in experiments.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Moiré bilayer materials show correlated insulating states.
  • Metal-insulator transitions (MITs) are observed in these materials.

Purpose of the Study:

  • To investigate MITs in Moiré bilayer materials away from strongly correlated regimes.
  • To develop a theoretical model for disorder-dominated MITs and quantum criticality.

Main Methods:

  • Experimental observation of MITs in Moiré bilayer devices.
  • Development of a minimal theoretical model incorporating interactions and disorder.

Main Results:

  • MITs in Moiré materials share similarities with disorder-dominated transitions.
  • The proposed model captures universal aspects of quantum criticality.

Conclusions:

  • Disorder plays a crucial role in MITs in Moiré bilayer materials.
  • The theoretical model provides a unified explanation for observed phenomena.