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TT: Fachverband Tiefe Temperaturen
TT 45: PtBi2 and Weyl Superconductors
TT 45.4: Talk
Wednesday, March 20, 2024, 12:15–12:30, H 3010
Surface superconductivity on time-reversal symmetric Weyl systems: a self-consistent approach — •Mattia Trama1,2,3, Viktor Könye3, Ion Cosma Fulga3, and Jeroen van den Brink3,4 — 1Physics Department "E.R. Caianiello", Universitá degli Studi di Salerno, Fisciano, Italy — 2INFN-Sezione di Napoli, Naples, Italy — 3Institute for Theoretical Solid State Physics, IFW Dresden and Würzburg-Dresden Cluster of Excellence ct.qmat, Dresden, Germany — 4Institute for Theoretical Physics, TU Dresden, Dresden, Germany
The recent discovery of the superconducting surface on the time-reversal symmetric Weyl semimetal PtBi2 has raised the question of the origin of such a phenomenon. Indeed, such a compound exhibits a critical temperature difference between the surface and the bulk of about an order of magnitude. Here we propose an explanation for this phenomenon using a time-reversal symmetric Weyl model for a finite system, invoking standard local s-wave singlet pairing as the superconducting coupling. Our self-consistent calculation predicts a different critical temperature for the surface and the bulk, leading to the possibility of superconductivity in only few layers of the material. We also predict a temperature dependence on the penetration of surface superconductivity, suggesting a competition between two order parameters.
Keywords: Weyl semimetal; Surface superconductivity; Self-consistent; Time reversal symmetry; Tight-binding