Evidence for long-lived quasiparticles trapped in superconducting point contacts

Abstract

We have observed that the supercurrent across phase-biased, highly transmitting atomic size contacts is strongly reduced within a broad phase interval around π. 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 Δ, 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.

Article (5 pages) AND Supplemental material (14 pages). To be published in Physical Review Letters

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• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Number fluctuations of sparse quasiparticles in a superconductor
• Kinetics of non-equilibrium quasiparticle tunneling in superconducting charge qubits
• Manipulation with Andreev states in spin active mesoscopic Josephson junctions

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