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Junction of three off-critical quantum Ising chains and two-channel Kondo effect in a superconductor

  • Domenico GiulianoEmail author
  • Gabriele Campagnano
  • Arturo Tagliacozzo
Regular Article

Abstract

We show that a junction of three off-critical quantum Ising chains can be regarded as a quantum spin chain realization of the two-channel spin-1/2 overscreened Kondo effect with two superconducting leads. We prove that, as long as the Kondo temperature is larger than the superconducting gap, the equivalent Kondo model flows towards the two channel Kondo fixed point. We argue that our system provides the first controlled realization of two channel Kondo effect with superconducting leads. Besides its theoretical interest, this result is of importance for potential applications to a number of contexts, including the analysis of the quantum entanglement properties of a Kondo system.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Domenico Giuliano
    • 1
    • 2
    Email author
  • Gabriele Campagnano
    • 3
  • Arturo Tagliacozzo
    • 3
    • 2
  1. 1.Dipartimento di Fisica, Università della Calabria Arcavacata di RendeCosenzaItaly
  2. 2.I.N.F.N., Gruppo collegato di Cosenza, Arcavacata di RendeCosenzaItaly
  3. 3.Dipartimento di Fisica, Università di Napoli “Federico II” and CNR-SPINNapoliItaly

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