Lattices (image)

University of Illinois College of Engineering

Caption

These are proposed Wigner crystals for magic-angle bilayer graphene. In Figure A, the criterion for observing this lattice structure is not satisfied experimentally, resulting in metallic transport when a single electron occupies a moiré cell. Figures B and C show the insulating state, explaining the experimental observation when 2 or 3 electrons are in a moiré cell.

Credit

Philip Phillips, University of Illinois at Urbana-Champaign

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