Screening Clouds and Majorana Fermions |
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Authors: | Ian Affleck Domenico Giuliano |
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Affiliation: | 1. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC?, V6T 1Z1, Canada 2. Dipartimento di Fisica, Università della Calabria Arcavacata di Rende, 87036?, Cosenza, Italy 3. I.N.F.N., Gruppo collegato di Cosenza, Arcavacata di Rende, 87036?, Cosenza, Italy 4. CNR SPIN, Monte S. Angelo, via Cinthia, 80126?, Napoli, Italy
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Abstract: | Ken Wilson developed the Numerical Renormalization Group technique which greatly enhanced our understanding of the Kondo effect and other quantum impurity problems. Wilson’s NRG also inspired Philippe Nozières to propose the idea of a large “Kondo screening cloud”. While much theoretical evidence has accumulated for this idea it has remained somewhat controversial and has not yet been confirmed experimentally. Recently a new possibility for observing an analogous crossover length scale has emerged, involving a Majorana fermion localized at the interface between a topological superconductor quantum wire and a normal wire. We give an overview of this topic both with and without interactions included in the normal wire. |
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