Interaction-Enhanced Coherence in Graphene and Topological Insulator Bilayers

ORAL

Abstract

We analyze the interlayer coherence properties of graphene and topological insulator electron-hole bilayers by solving imaginary-axis Dirac-model gap equations in the random phase approximation. By accounting self-consistently for the dynamical screening of Coulomb interactions in the gapped phase, we find that the gap can rise to values of the order of the Fermi energy in the strong interactions regime. For graphene, we comment on the supportive role of remote bands not included in our two-band Dirac model.

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Authors

  • Inti Sodemann

    University of Texas at Austin

  • Dmytro Pesin

    The University of Texas at Austin, Austin, TX, University of Texas, Austin, University of Texas at Austin

  • Allan MacDonald

    University of Texas at Austin, Department of Physics, University of Texas at Austin, Department of Physics, University of Texas at Austin, Austin, Texas 78712, Department of Physics, University of Texas at Austin, USA