Persistent current states in bilayer graphene

Jeil Jung, Marco Polini, and A. H. MacDonald
Phys. Rev. B 91, 155423 – Published 20 April 2015

Abstract

We argue that at finite carrier density and large displacement fields, bilayer graphene is prone to =0 and =1 Pomeranchuk Fermi-surface instabilities. The broken symmetries are driven by nonlocal exchange interactions which favor momentum-space condensation. We find that electron-electron interactions lead first to spontaneous valley polarization, which breaks time-reversal invariance and is associated with spontaneous orbital magnetism, and then under some circumstances to a nematic phase with reduced rotational symmetry. When present, nematic order is signaled by reduced symmetry in the dependence of optical absorption on light polarization.

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  • Received 2 March 2015

DOI:https://doi.org/10.1103/PhysRevB.91.155423

©2015 American Physical Society

Authors & Affiliations

Jeil Jung1,2,*, Marco Polini3, and A. H. MacDonald1

  • 1Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
  • 2Department of Physics, University of Seoul, Seoul, 130-743, Korea
  • 3NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56126 Pisa, Italy

  • *jeil.jung@gmail.com

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Issue

Vol. 91, Iss. 15 — 15 April 2015

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