Phases of a phenomenological model of twisted bilayer graphene

ORAL

Abstract

We propose a lattice scale two-band generalized Hubbard model as a caricature of the electronic structure of twisted bilayer graphene. Various possible broken symmetry phases can arise, including a nematic phase (which is a form of orbital ferromagnet) and an orbital-triplet spin-singlet superconducting phase. Concerning the mechanism of superconductivity -- we propose an analogy with superconductivity in alkali-doped C_{60} in which a violation of Hund's first rule plays a central role.

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Presenters

  • Chao Wang

    Physics Department, Stanford University

Authors

  • John Dodaro

    Physics Department, Stanford University, Stanford University

  • Steven Kivelson

    Physics Department, Stanford University, Stanford University

  • Yoni Schattner

    Physics Department, Stanford University, Stanford Insitute for Material and Energy Science

  • Xiao-Qi Sun

    Physics Department, Stanford University, Stanford University

  • Chao Wang

    Physics Department, Stanford University