Evidence for long-lived quasiparticles trapped in superconducting point contacts

C. Urbina; D. Esteve; H. Pothier; L. Bretheau; M. Zgirski; Q. Le Masne

Evidence for long-lived quasiparticles trapped in superconducting point contacts

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arxiv 1105.5039 v4 pith:I5X375TO submitted 2011-05-25 cond-mat.mes-hall cond-mat.supr-con

Evidence for long-lived quasiparticles trapped in superconducting point contacts

M. Zgirski , L. Bretheau , Q. Le Masne , H. Pothier , D. Esteve , C. Urbina This is my paper

classification cond-mat.mes-hall cond-mat.supr-con

keywords andreevcontactsenergyquasiparticlessuperconductingtrappedtrappingacross

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We have observed that the supercurrent across phase-biased, highly transmitting atomic size contacts is strongly reduced within a broad phase interval around {\pi}. We attribute this effect to quasiparticle trapping in one of the discrete sub-gap Andreev bound states formed at the contact. Trapping occurs essentially when the Andreev energy is smaller than half the superconducting gap {\Delta}, a situation in which the lifetime of trapped quasiparticles is found to exceed 100 \mus. The origin of this sharp energy threshold is presently not understood.

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