Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 68: Transport: Majorana Fermions
TT 68.7: Vortrag
Donnerstag, 10. März 2016, 12:15–12:30, H19
Universal transport characteristics of multiple topological superconducting wires with large charging energy — •Oleksiy Kashuba1, Carsten Timm2, and Björn Trauzettel1 — 1Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Deutschland — 2Institut für Theoretische Physik, TU Dresden, 01062 Dresden, Deutschland
The system with multiple Majorana states coupled to the normal lead can potentially support the interaction between Majorana fermions and electrons. Such system can be implemented by several floating topological superconducting wires with large charging energy asymmetrically coupled to two normal leads. The analysis of the renormalization flow shows that there is a single fixed point — the strong coupling limit of isotropic antiferromagnetic Kondo model. The topological Kondo-like interaction leads also to the selective renormalization of the tunneling coefficients, strongly enhancing one component and suppressing others. Thus, charging energy crucially changes the transport properties of the system leading to the universal single-channel conductance independently from the values of the initial leads-wires coupling.