Topological charge pumping in twisted bilayer graphene
Abstract
We show that a sliding motion between the two layers of a superlattice induces an electric current and realizes a two-dimensional version of the topological Thouless pump when the Fermi energy lies in one of the minigaps. Interestingly, a chiral charge pump, namely, a transverse current induced by the sliding motion, is possible in twisted homobilayers. This result is confirmed by a concrete calculation of the adiabatic current in twisted bilayer graphene. Our work reveals an interesting link between mechanical motion and electricity unique to superlattices, and may find applications in nanogenerators and nanomotors.
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