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Non-local annihilation mechanism in momentum space for correlated Weyl fermions.

ORAL

Abstract

We discuss the effects of interaction in Weyl semimetals with broken time-reversal symmetry. The spin degeneracy of the gapless Dirac point at the topological quantum phase transition is resolved resulting in two gapless Weyl nodes separated in momentum space. For free fermions, the topological transition requires the two Weyl nodes to annihilate continuously in momentum space. Yet, we show that in presence of a stron local Coulomb repulsion this paradigm breaks down, opening a non-local annihilation channel for the Weyl cones.

L. Crippa, A. Amaricci, N. Wagner, G. Sangiovanni, J. C. Budich and M. Capone -- arXiv:1904.11836

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Presenters

  • Giorgio Sangiovanni

    University of Wurzburg, University of Wuerzburg (Germany), Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, University of Würzburg, Universitaet Wuerzburg, Institut fuer Theoretische Physik und Astrophysik and Wuerzburg-Dresden Cluster of Excellence ct.qmat

Authors

  • Giorgio Sangiovanni

    University of Wurzburg, University of Wuerzburg (Germany), Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, University of Würzburg, Universitaet Wuerzburg, Institut fuer Theoretische Physik und Astrophysik and Wuerzburg-Dresden Cluster of Excellence ct.qmat

  • Adriano Amaricci

    SISSA, Scuola Internazionale Superiore di Studi Avanzati (SISSA)

  • Lorenzo Crippa

    SISSA, Scuola Internazionale Superiore di Studi Avanzati (SISSA)

  • Niklas Wagner

    Universitaet Wuerzburg, Institut fuer Theoretische Physik und Astrophysik and Wuerzburg-Dresden Cluster of Excellence ct.qmat

  • Jan Budich

    Physics, TU Dresden, Technical University Dresden, Institute of Theoretical Physics, Technische Universitaet Dresden

  • Massimo Capone

    SISSA, Scuola Internazionale Superiore di Studi Avanzati (SISSA)