Possible broken inversion and time-reversal symmetry state of electrons in bilayer graphene

Xin-Zhong Yan and C. S. Ting
Phys. Rev. B 86, 235126 – Published 17 December 2012

Abstract

With the two-band continuum model, we study the broken inversion and time-reversal symmetry state of electrons with finite-range repulsive interactions in bilayer graphene. In the state, there are overlapped loop currents in each layer. With the analytical solution to the mean-field Hamiltonian, we obtain the electronic spectra. The ground state is gapped. In the presence of the magnetic field B, the energy gap grows with increasing B, in excellent agreement with the experimental observation. Such an energy-gap behavior originates from the disappearance of a Landau level of n=0 and 1 states. The present result resolves explicitly the puzzle of the gap dependence of B.

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  • Received 27 September 2012

DOI:https://doi.org/10.1103/PhysRevB.86.235126

©2012 American Physical Society

Authors & Affiliations

Xin-Zhong Yan1 and C. S. Ting2

  • 1Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China
  • 2Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA

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Issue

Vol. 86, Iss. 23 — 15 December 2012

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