Condensed Matter Physics Seminar

Dr Benjamin Beri, Birmingham University

Friday 13 June 2014, 1500-1600
C1 Physics Building

Topological Kondo effect with Majorana fermions

The Kondo effect is a striking consequence of the coupling of itinerant electrons to a quantum spin with degenerate levels. While degeneracies usually arise from symmetries or fine-tuning of parameters, the discovery of Majorana fermions introduced a new possibility: a "topological degeneracy" arising from the nonlocal character of the Majoranas. In this talk I shall describe how nonlocal quantum spins formed from these degrees of freedom give rise to a novel "topological Kondo effect". Focusing on mesoscopic superconductor devices, I shall discuss several transport signatures which would demonstrate the emerging non-Fermi liquid behaviour, the key strong correlation feature of the effect; and probe the non-local quantum dynamics of Majorana fermions, a key feature for their use in topological quantum computation.