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TT: Fachverband Tiefe Temperaturen

TT 109: Transport: Majorana Fermions (jointly with DS, HL, MA, O)

TT 109.7: Vortrag

Freitag, 20. März 2015, 11:15–11:30, H 0104

Topological Kondo Effect in Transport through a Superconducting Wire with Multiple Majorana End States — •Oleksiy Kashuba and Carsten Timm — Institute für Theoretische Physik, Technische Universität Dresden

We investigate a system of multiple Majorana states at the end of a topological superconducting wire coupled to a normal lead. For a minimum of three Majorana fermions at the interface, we find nontrivial renormalization physics. Interface tunneling processes can be classified in terms of spin-1/2 and spin-3/2 irreducible representations of the SU(2) group. We show that the renormalization of the tunneling amplitudes belonging to different representations is completely different in that one type is suppressed, whereas the other is enhanced, depending on the sign of the interaction coupling. This results in distinct temperature dependencies of the tunneling current through the interface and different spin polarizations of this current.