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A moiré superlattice on the surface of a topological insulator

ORAL

Abstract

Twisting two materials produces moiré patterns and can induce correlated many-body states, as seen in twisted bilayer graphene, for example. We investigate the surface state of a topological insulator subject to a moiré superlattice potential. With diagrammatic perturbation theory, lattice model simulations, and ab initio calculations, we uncover the unique aspects of twisting a single Dirac cone with an induced moiré superlattice and the role of bulk topology on the reconstructed bands. The Dirac cone velocity renormalizes, but no gap opens up; instead, a whole ladder of satellite Dirac cones appears, some of which can be made relatively flat with a large nearby density of states. We discuss the implications of our findings to correlated physics and future experiments.

Work appears in arXiv:2010.09726

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Presenters

  • Justin Wilson

    Rutgers University, New Brunswick, Department of Physics, Rutgers, Rutgers University

Authors

  • Justin Wilson

    Rutgers University, New Brunswick, Department of Physics, Rutgers, Rutgers University

  • Jennifer Cano

    Stony Brook University, Stony Brook University, USA, Physics and Astronomy, Stony Brook University, Flatiron Institute; Stony Brook Univ., Department of Physics, Stonybrook University, Department of Physics and Astronomy, Stony Brook University, State Univ of NY - Stony Brook

  • Shiang Fang

    Rutgers University, Department of Physics and Astronomy, Rutgers University, Department of Physics, Rutgers

  • Jed Pixley

    Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, Department of Physics, Rutgers, Rutgers University, Rutgers, The State University of New Jersey