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  • Letter
  • Open Access

Massive Dirac fermions in moiré superlattices: A route towards topological flat minibands and correlated topological insulators

Ying Su1,2, Heqiu Li3,4, Chuanwei Zhang2, Kai Sun3, and Shi-Zeng Lin1

  • 1Theoretical Division, T-4 and CNLS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 2Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080, USA
  • 3Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
  • 4Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada

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Phys. Rev. Research 4, L032024 – Published 12 August, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L032024

Abstract

We demonstrate a generic mechanism to realize topological flat minibands by confining massive Dirac fermions in a periodic moiré potential, which can be achieved in a heterobilayer of transition metal dichalcogenides. We show that the topological phase can be protected by the symmetry of moiré potential and survive to arbitrarily large Dirac band gap. We take the MoTe2/WSe2 heterobilayer as an example and find that the topological phase can be driven by a vertical electric field. By projecting the Coulomb interaction onto the topological fat minibands, we identify a correlated Chern insulator at half filling and a quantum valley-spin Hall insulator at full filling which explains the topological states observed in the MoTe2/WSe2 in the experiment. Our work clarifies the importance of Dirac structure for the topological minibands and unveils a general strategy to design topological moiré materials.

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Phys. Rev. Research 4, L032024– Published 12 August, 2022
  • Received 6 October 2021
  • Revised 20 June 2022
  • Accepted 26 July 2022
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