Competition between superconductivity and topological Kondo effect in Majorana devices

  • Data: 09 gennaio 2018 dalle 15:00 alle 16:00

  • Luogo: Aula Teorici, via Irnerio 46, Bologna

Contatto di riferimento:

Partecipanti: Dr. Francesco Buccheri: Institut für Theoretische Physik, Heinrich-Heine-Universität, Düsseldorf

Abstract: 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.