Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 93: Superconductivity: (General) Theory
TT 93.2: Talk
Thursday, April 3, 2014, 16:45–17:00, HSZ 201
Flat bands at surfaces of nodal topological superconductors: Spin polarization and charge currents — •Carsten Timm1, Philip M. R. Brydon2,1, and Andreas P. Schnyder3 — 1Institute of Theoretical Physics, Technische Universität Dresden, Dresden, Germany — 2Condensed Matter Theory Center, University of Maryland, College Park, USA — 3Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
Noncentrosymmetric superconductors with strong spin-orbit coupling generically show coexisting singlet and triplet pairing. If the superconducting gap has nodes on the Fermi surface, the system exhibits topologically protected flat surface bands. Employing exact diagonalization of lattice models and quasiclassical methods, we show that the flat-band states are strongly spin polarized. Since the spin polarization is odd in momentum, the surface states acquire a chiral dispersion if the superconductor is brought into contact with a ferromagnet. These chiral states carry a large charge current. We compare the results to a fully gapped topological superconductor.