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Observation of flat bands in twisted bilayer graphene

Published on October 8, 2020

An international team of scientists from Geneva, Barcelona, and Leiden have revealed what makes magic angle graphene so special.

We combined different imaging techniques and angle-resolved photoemission with simultaneous real- and momentum-space resolution (nano-ARPES) to directly map the band dispersion in twisted bilayer graphene devices near charge neutrality. Our experiments reveal large areas with a homogeneous twist angle that support a flat band with a spectral weight that is highly localized in momentum space. The flat band is separated from the dispersive Dirac bands, which show multiple moiré hybridization gaps. These data establish the salient features of the twisted bilayer graphene band structure.

Simone Lisi et al., Nature Physics (2020).