SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 63: Superconductivity: Theory
TT 63.12: Vortrag
Freitag, 31. März 2023, 12:30–12:45, HSZ 103
Chiral surface superconductivity in half-Heusler semimetals — •Tilman Schwemmer1, Domenico Di Sante2,3, Jörg Schmalian4, and Ronny Thomale1 — 1Institute for Theoretical Physics, University of Wuerzburg, D-97074 Wuerzburg, Germany — 2Department of Physics and Astronomy, University of Bologna, 40127 Bologna, Italy — 3CCQ, Flatiron Institute, New York, NY 10010, USA — 4Institute for Theory of Condensed Matter and Institute for Quantum Materials and Technologies, KIT, Karlsruhe 76131, Germany
We propose the metallic and weakly dispersive surface states of half-Heusler semimetals as a possible domain for the onset of unconventional surface superconductivity ahead of the bulk transition. Using density functional theory (DFT) calculations and the random phase approximation (RPA), we analyse the surface band structure of LuPtBi and its propensity towards Cooper pair formation induced by screened electron-electron interactions in the presence of strong spin-orbit coupling. Over a wide range of model parameters we find a chiral superconducting condensate featuring Majorana edge modes to be favoured energetically, while low-dimensional order parameter fluctuations trigger time-reversal symmetry breaking preceding the superconducting transition.