Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: PtBi2
TT 11.5: Talk
Monday, March 9, 2026, 12:15–12:30, CHE/0091
Phonon and Coulomb mechanism for nodal topological superconductivity on PtBi2 surface — •Kristian Maeland, Giorgio Sangiovanni, and Björn Trauzettel — Institute for Theoretical Physics and Astrophysics, University of Würzburg and Würzburg-Dresden Cluster of Excellence ct.qmat, D-97074 Würzburg, Germany
Experiments show that the Weyl semimetal PtBi2 hosts unconventional superconductivity in its topological surface states. Hence, the material is a candidate for intrinsic topological superconductivity. Measurements indicate nodal gaps in the center of the Fermi arcs. We show that unusually anisotropic electron-phonon coupling on Weyl semimetal surfaces combined with statically screened Coulomb repulsion is a microscopic mechanism for the i-wave pairing. We solve the linearized gap equation close to the critical temperature and find nodal gaps when the surface state bandwidth is comparable to the maximum phonon energy, as is the case in PtBi2.
Keywords: Weyl semimetal; Topological superconductivity; Fermi arcs; Phonons; Coulomb