title: Edge currents as a signature of flatbands in topological superconductors.
abstract: We study nondegenerate flatbands at the surfaces of noncentrosymmetric topological superconductors by exact diagonalization of Bogoliubov-de Gennes Hamiltonians. We show that these states are strongly spin polarized and acquire a chiral dispersion when placed in contact with a ferromagnetic insulator. This chiral mode carries a large edge current which displays a singular dependence on the exchange-field strength. The contribution of other edge states to the current is comparably weak. We hence propose that the observation of the edge current can serve as a test of the presence of nondegenerate flatbands.
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany. a.schnyder@fkf.mpg.de
authors.forename: Andreas P
authors.initials: AP
authors.lastname: Schnyder
authors.forename: Carsten
authors.initials: C
authors.lastname: Timm
authors.forename: P M R
authors.initials: PM
authors.lastname: Brydon