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Phases of a phenomenological model of twisted bilayer graphene

J. F. Dodaro, S. A. Kivelson, Y. Schattner, X. Q. Sun, and C. Wang
Phys. Rev. B 98, 075154 – Published 28 August 2018

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 C60 in which a violation of Hund's first rule plays a central role.

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  • Received 8 May 2018

DOI:https://doi.org/10.1103/PhysRevB.98.075154

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. F. Dodaro1, S. A. Kivelson1, Y. Schattner1,2, X. Q. Sun1, and C. Wang1

  • 1Department of Physics, Stanford University, Stanford, California 94305, USA
  • 2Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, California 94025, USA

See Also

Band structure of twisted bilayer graphene: Emergent symmetries, commensurate approximants, and Wannier obstructions

Liujun Zou, Hoi Chun Po, Ashvin Vishwanath, and T. Senthil
Phys. Rev. B 98, 085435 (2018)

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Issue

Vol. 98, Iss. 7 — 15 August 2018

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