Experimental determination of the quasiparticle decay length ξqp in a diffusive superconducting quantum well

P.H.C. Magnée, S.G. den Hartog, B.J. van Wees, T.M. Klapwijk

    OnderzoeksoutputAcademicpeer review

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    We have experimentally investigated the electronic transport properties of an AlSb/InAs/AlSb quantum well, where part of the AlSb top layer has been replaced with a superconducting Nb strip. By doing a transmission experiment underneath the Nb strip and comparing the results with a model based on diffusive transport, with some of the injected electrons being Andreev reflected into holes, we can estimate the quasiparticle decay length, xi(qp) similar to 50 nm, in the Nb-InAs superconducting quantum well. This decay length corresponds to an interface transparency of T-SIN = 0.5 between the Nb and InAs. The observed voltage dependence cannot entirely be understood within the presented model.

    Originele taal-2English
    Pagina's (van-tot)11630-11633
    Aantal pagina's4
    TijdschriftPhysical Review B
    Nummer van het tijdschrift16
    StatusPublished - 15-okt-1995

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