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

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  • Domenico Giuliano

    (Dipartimento di Fisica, Università della Calabria Arcavacata di Rende
    I.N.F.N., Gruppo collegato di Cosenza, Arcavacata di Rende)

  • Gabriele Campagnano

    (Dipartimento di Fisica, Università di Napoli “Federico II” and CNR-SPIN)

  • Arturo Tagliacozzo

    (I.N.F.N., Gruppo collegato di Cosenza, Arcavacata di Rende
    Dipartimento di Fisica, Università di Napoli “Federico II” and CNR-SPIN)

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.

Suggested Citation

  • Domenico Giuliano & Gabriele Campagnano & Arturo Tagliacozzo, 2016. "Junction of three off-critical quantum Ising chains and two-channel Kondo effect in a superconductor," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 89(11), pages 1-11, November.
    • Handle: RePEc:spr:eurphb:v:89:y:2016:i:11:d:10.1140_epjb_e2016-70477-7
    DOI: 10.1140/epjb/e2016-70477-7
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    Solid State and Materials;

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