Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.16: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
Edge states in a spin-triplet multi-band superconductor — •Yoshiki Imai1,2 and Manfred Sigrist1 — 1Institute for Theoretical Physics, ETH Zurich, Zurich, Switzerland — 2Department of Physics, Saitama University, Saitama, Japan
Motivated by the multi-band spin triplet superconductor Sr2RuO4 we investigate the properties of a 2D two-band system with an electron- and hole-like Fermi surfaces within a tight-binding model including inter-orbital hybridization and spin-orbit coupling effects. The band structure is chosen as to support spontaneous spin currents flowing along edges in the normal state. In our study we focus on helical and chiral spin-triplet pairing states and their influence on the states at the edge. Both states have topological character and yield, despite a full quasiparticle excitation gap in the bulk, gapless edge states with contributions to spontaneous spin and/or charge currents. We elucidate how electron- and hole-like particles interfere with each other in the formation of these edge states and edge currents. In this context multi-orbital and topological properties are discussed.