The emergence of flat bands and correlated behaviors in 'magic angle' twisted graphene (tBLG) has sparked tremendous interest, though many aspects of system are under intense debate. Here we report observation of both and the Mott-like insulating state in a tBLG device with a angle of approximately 0.93, which is smaller than the magic angle by15%. At an electron concentration of +/-5 electrons per moire unit cell, we a narrow resistance peak with an activation energy gap of approximately0.1 meV, indicating the existence of an additional correlated insulating state. is consistent with theory predicting the presence of a high-energy band an energetically flat dispersion. At a doping of +/-12 electrons per moire cell we observe a resistance peak due to the presence of Dirac points in spectrum. Our results reveal that the magic range of tBLG is in fact larger what is previously expected, and provide a wealth of new information to decipher the strongly correlated phenomena observed in tBLG.
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Codecido et al. (2019) studied this question.