Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 10: Topological Semimetals

TT 10.7: Talk

Monday, March 17, 2025, 16:45–17:00, H36

Phonon-mediated surface superconductivity in Weyl semimetals — •Kristian Maeland and Björn Trauzettel — Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany

Recent experiments show that Weyl semimetals can host surface superconductivity in the Fermi arcs, while remaining metallic in the bulk. We study a lattice model of a Weyl semimetal to see if phonons are a candidate pairing mechanism to explain this phenomenon. Specifically, we study the pairing mechanism in detail on the surface and in the bulk. Furthermore, we make predictions about the critical temperature and the momentum dependence of the gap function.

Keywords: Weyl semimetal; Unconventional superconductivity; Fermi arcs; Phonons; Topology