Today's #arXivsummary: https://arxiv.org/abs/2303.15505 by Popov & Tarnopolsky. Authors consider three stacked graphene monolayers with equal consecutive twist angles. In chiral limit when interlayer couplings ignored, four perfect flat bands found. At magic angles, upper and lower bands touch four exactly flat bands at Dirac point in middle of graphene layer. #CondMat #StrEl #arXiv_2303_15505