Competition between superconductivity and topological Kondo effect in Majorana devices

by Dr. Francesco Buccheri (Institut für Theoretische Physik, Heinrich-Heine-Universität, Düsseldorf)

Tuesday, 9 January 2018 from to (Europe/Rome)
at Dipartimento di Fisica e Astronomia ( Aula Teorici )
Via Irnerio, 46
I will introduce a simple device featuring competition between  superconductivity and multi-channel Kondo physics. Under specific conditions, a mesoscopic island can host a set of zero-energy Majorana modes, localized at  the ends of a set of one-dimensional topological superconductors. A spin  degree of freedom can then be nonlocally defined in terms of the associated  degenerate states. Connecting the island to external wires via tunnel-coupling  provides a realization of the so-called topological Kondo model. I will  present the effect of pairing interactions in the external leads on the low- temperature physics and on the Josephson current between the external wires.