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
L. Crippa, A. Amaricci, N. Wagner, G. Sangiovanni, J. C. Budich and M. Capone -- arXiv:1904.11836
*A.A. and M.C. acknowledge support from H2020 Framework Programme, under ERC AdvancedGrant No. 692670 “FIRSTORM”. L.C., A.A. and M.C.acknowledge financial support from MIUR PRIN 2015(Prot. 2015C5SEJJ001) and SISSA/CNR project “Superconductivity, Ferroelectricity and Magnetism in badmetals” (Prot.232/2015). J.C.B. acknowledges financial support from the German Research Foundation (DFG) through the Collaborative Research Centre SFB 1143. G.S. acknowledges financial support bythe DFG through SFB 1170 “ToCoTronics” and the Wuerzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter – ct.qmat (EXC2147, project-id 39085490).
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Presenters
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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