Harmonic Fingerprint of Unconventional Superconductivity

ORAL

Abstract

The structure of superconducting pairing is determined by microscopic details such as the interaction profile and Fermiology beyond the spatial symmetry classification along irreducible point group representations of the underlying lattice. The pairing wave function unfolds in its orbital-resolved Fourier profile which we call the harmonic fingerprint (HFP), allowing us to formulate a concise connection between microsopic parameter changes and their impact on superconductivity. We present an analysis - based on random phase approximation calculations - of twisted bilayer graphene (TBG) involving d+id, s±, and f-wave order. Including nonlocal interactions - which unavoidably enter the low-energy electronic description of TBG - increases the weight of higher lattice harmonics and furthermore has a significant effect on the orbital structure of the paring states.

*The work in Wuerzburg is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Founda- tion) through Project-ID 258499086 - SFB 1170 and through the Wuerzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter –ct.qmat Project-ID 39085490 - EXC 2147.

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Presenters

  • Michael Klett

    • Institute for Theoretical Physics, University of Wuerzburg
    • University of Wuerzburg

Authors

  • Michael Klett

    • Institute for Theoretical Physics, University of Wuerzburg
    • University of Wuerzburg

  • Xianxin Wu

    • Institute for Theoretical Physics, University of Wuerzburg
    • Institut für Theoretische Physik und Astrophysik, Universität Würzburg
    • Physics department, Pennsylvania State University
    • University of Wurzburg
    • Institut für Theoretische Physik und Astrophysik, University of Würzburg

  • Tilman Schwemmer

    • Institute for Theoretical Physics, University of Wuerzburg
    • Institut für Theoretische Physik und Astrophysik, Universität Würzburg

  • Mario Fink

    • Institute for Theoretical Physics, University of Wuerzburg
    • Institut für Theoretische Physik und Astrophysik, University of Würzburg

  • Werner R Hanke

    • Institute for Theoretical Physics, University of Wuerzburg
    • Institut für Theoretische Physik und Astrophysik, Universität Würzburg
    • Institut für Theoretische Physik und Astrophysik, University of Würzburg
    • Universität Würzburg, Germany

  • Ronny Thomale

    • University of Wurzburg
    • Institute for Theoretical Physics, University of Wuerzburg
    • Theoretical physics I, University of Wuerzburg
    • University of Wuerzburg
    • Institut für Theoretische Physik und Astrophysik, Universität Würzburg
    • Physics department, University of Wuerzburg
    • Institut für Theoretische Physik und Astrophysik, University of Würzburg
    • Institute for Theoretical Physics and Astrophysics, University of Wurzburg