Cooper-like instability in an excitonic insulator

ORAL

Abstract

We explore the crossover from weak to strong correlations in Dirac materials for the excitonic insulator transition in a paradigmatic family of ‘slow’ graphene, i.e. graphene with renormalized bands. Two different models are considered, contrasting a mean-field model with a Bethe-Salpeter calculation. Our analysis reveals competition between condensation of q=0 and q = (pi,0) excitons, with the latter splitting the Van Hove singularities of the graphene bands.

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Presenters

  • Baokai Wang

    • Northeastern University
    • Physics, Northeastern Univ

Authors

  • Baokai Wang

    • Northeastern University
    • Physics, Northeastern Univ

  • Robert Markiewicz

    • Physics, Northeastern Univ

  • Alexander Balatsky

    • NORDITA
    • Institute for Materials Science, Los Alamos National Laboratory
    • Nordita
    • Los Alamos Natl Lab
    • Nordita, KTH Royal Institute of Technology and Stockholm University; Institute for Materials Science, Los Alamos National Laboratory; Department of Physics, University of Conn
    • Instittute for Materials Science, Los Alamos National Laboratory
    • Institute for Materials Science, Los Alamos National Laboratory/Nordita/University of Connecticut

  • Arun Bansil

    • Physics, Northeastern University
    • Department of Physics, Northeastern University
    • Northeastern University
    • Physics, Northeastern Univ