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TT: Fachverband Tiefe Temperaturen
TT 24: Unconventional Superconductors
TT 24.9: Vortrag
Mittwoch, 19. März 2025, 12:15–12:30, H31
Unconventional Superconductivity in Trigonal PtBi2: Ginzburg–Landau Theory — Harald Waje1, Ion Cosma Fulga2, Jeroen van den Brink2,3, and •Carsten Timm1,3 — 1TU Dresden, 01062 Dresden, Germany — 2Leibniz Institute for Solid State and Materials Research Dresden (IFW), 01069 Dresden, Germany — 3Würzburg-Dresden Cluster of Excellence ct.qmat, TU Dresden, 01062 Dresden, Germany
Trigonal PtBi2 is a Weyl semimetal that exhibits unconventional surface superconductivity carried by the Fermi arcs [1]. Recent results indicate that the superconducting gap might be nodal, i.e., exhibiting topologically protected Majorana cones. There are three possible superconducting order parameters, corresponding to the three irreducible representations A1, A2, and E of the noncentrosymmetric point group C3v. The gap has s-wave (l=0), i-wave (l=6), or d-wave (l=2) symmetry, respectively. We set up a Ginzburg–Landau theory for these order parameters, which also includes coupling to an applied magnetic field. Finally, we discuss some effects described by this theory, such as field-induced pair-density waves.
[1] A. Kuibarov et al., Nature 626, 294 (2024).
Keywords: topological superconductors; surface superconductivity; Ginzburg-Landau theory; nodal gap