# Theoretical Physics

**19 May 2015**

**Time:**13:30 to 14:30

**Location:**9.90 EC Stoner

Theoretical Seminar - Benjamin Beri

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.

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