Strong Correlations and d+id Superconductivity in Twisted Bilayer Graphene

ORAL

Abstract

We compute the phase diagram of twisted bilayer graphene near the magic angle where the occurrence of flat bands enhances the effects of electron-electron interactions and thus unleashes strongly-correlated phenomena. Most importantly, we find a crossover between d+id superconductivity and Mott insulating behavior near half-filling of the lowest electron band when the temperature is increased. This is consistent with recent experiments. Our results are obtained using unbiased many-body renormalization group techniques combined with a mean-field analysis of the effective couplings.

*DMK and CK acknowledge support by the Deutsche Forschungsgemeinschaft through the Emmy Noether program (KA 3360/2-1)

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Presenters

  • Johannes Lischner

    • Imperial College London
    • Department of Materials and Department of Physics, Imperial College London

Authors

  • Johannes Lischner

    • Imperial College London
    • Department of Materials and Department of Physics, Imperial College London

  • Dante Kennes

    • Freie Universitaet Berlin
    • Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universitat Berlin
    • Max Planck Institute for the Structure and Dynamics of Matter
    • Freie Universität Berlin
    • Physics, Freie Universität Berlin
    • Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin
    • Fachbereich Physik, Freie Universit{\"a}t Berlin
    • Columbia University

  • Christoph Karrasch

    • Freie Universitaet Berlin
    • Physics, Freie Universität Berlin
    • Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin