Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 77: Low-dimensional systems: Topological order 1 (TT with HL)
HL 77.5: Vortrag
Donnerstag, 19. März 2015, 12:30–12:45, H 3010
Route to Topological Superconductivity via Magnetic Field Rotation — •Florian Loder, Arno P. Kampf, and Thilo Kopp — Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Germany
Apart from the very few spin-triplet superconductors with p-wave pairing symmetry, a candidate system for topological superconductivity is a conventional, two-dimensional s-wave superconductor in a magnetic field with a sufficiently strong Rashba spin-orbit coupling. Typically, the required magnetic field to convert the superconductor into a topologically non-trivial state is however by far larger than the upper critical field Hc2, which excludes its realization. Here we argue that this problem is overcome by rotating the magnetic field into the superconducting plane. We explore the topological transitions which occur upon changing the strength and the orientation of the magnetic field and show that an unusual superconducting state with finite-momentum pairing exists, which preserves its topological nature up to an in-plane field orientation. We discuss the realizability of this state at the superconducting interface between LaAlO3 and SrTiO3.