Topological sliding moire heterostructure

Article

关键词: DIRAC FERMIONS;    GRAPHENE;    INSULATOR;   

DOI  :  10.1103/PhysRevB.101.041113

来源: SCIE

【 摘 要 】

We investigate the effect of the sliding motion of layers in moire heterostructures on the electronic state. We show that the sliding moire heterostructure can generate nontrivial topology characterized by the first and second Chern number in the high-dimensional manifold spanned by the physical dimensions and synthetic dimensions associated with the sliding displacement. The nontrivial topology implies a topological charge pumping caused by the sliding motion. We demonstrate the nontrivial topology and charge pumping explicitly in a one-dimensional bichain model and small-angle twisted bilayer graphene. Contrary to the conventional belief that the interlayer sliding in incommensurate moire heterostructures does not affect the electronic structure, our results reveal that the sliding motion can generate nontrivial topology dynamically and hence cannot be neglected in the dynamical process.

【 授权许可】

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