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TT: Fachverband Tiefe Temperaturen

TT 102: Topology: Majorana Fermions

TT 102.1: Vortrag

Donnerstag, 15. März 2018, 16:00–16:15, A 053

Structure and dynamics of Majorana states in hybrid superconducting nanowires — •Ivan Khaymovich^{1, 2}, Alexander Kopasov², Jukka Pekola³, and Alexander Mel'nikov^{2, 4} — ¹Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany — ²Institute for Physics of Microstructures, Russian Academy of Sciences, 603950 Nizhny Novgorod, GSP-105, Russia — ³Low Temperature Laboratory, Department of Applied Physics, Aalto University School of Science, P.O. Box 13500, FI-00076 Aalto, Finland — ⁴Lobachevsky State University of Nizhny Novgorod, 23 Gagarina, 603950 Nizhny Novgorod, Russia

We perform a microscopic analysis of the inverse proximity effect in superconducting hybrid structures hosting Majorana bound states (MBS) as well as of the dynamic response of MBS in such systems. the critical temperature of the semiconducting nanowires with large g-factor and spin-orbit interaction, covered by a superconducting film and placed in a magnetic field H, is shown to be significantly reduced due to the presence of van Hove singularities in the wire and have a non-monotonic H-dependence attributed to the topological regime. Nonlocal AC response of a pair of MBS in a system with effective p-wave gap parameter is studied using a time-dependent Bogolubov-de Gennes equations. The time-dependent perturbations of transport excite finite period beating of the wave function between the MBS. We propose an experimental test to measure the characteristic time scales of quasiparticle transport through the pair of MBS defining, thus, quantitative characteristics of nonlocality attributed to MBS.