The electronic structure of 3°-twisted bilayer graphene (TBG) is studied by angle-resolved photoelectron spectroscopy (ARPES). Sub-mm-sized TBG prepared by direct bonding in a high vacuum enabled us to use conventional ARPES band mapping with synchrotron light. The results indicate that strong interlayer coupling makes a moiré potential for the Dirac electrons and significantly modifies the graphene bands around the K̄ points such as the band splitting and electron velocity reduction. The observed electronic structure is consistently reproduced by tight-binding calculations combined with a band unfolding method.
|ジャーナル||Physical Review Materials|
|出版ステータス||Published - 2021 5|
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