Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 83: Superconductivity: (General) Theory
TT 83.4: Vortrag
Donnerstag, 15. März 2018, 10:15–10:30, HFT-FT 101
Multiband superconductivity in noncentrosymmetric YPtBi — •Carsten Timm1, Andreas P. Schnyder2, Daniel F. Agterberg3, and Philip M. R. Brydon4 — 1Institute of Theoretical Physics, Technische Universität Dresden, Germany — 2MPI for Solid State Research, Stuttgart, Germany — 3Department of Physics, University of Wisconsin, Milwaukee, U.S.A. — 4Department of Physics, University of Otago, Dunedin, New Zealand
Half-Heusler superconductors such as YPtBi combine two aspects of high current interest: they display noncentrosymmetric and multiband superconductivity. We study bulk and surface states in two exemplary nodal superconducting phases, which transform as the A1 and T2 irreducible representations of the crystallographic point group, respectively. The A1 phase preserves time-reversal symmetry. We find that flat surface bands persist in the presence of multiband pairing. In addition, there are symmetry-protected Fermi arcs of surface states. On the other hand, the T2 phase breaks time-reversal symmetry. In the bulk, point and line nodes coexist with two-dimensional Bogoliubov Fermi surfaces. The surface exhibits Fermi arcs associated with the bulk point nodes.