title: 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 subgap 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 μs. The origin of this sharp energy threshold is presently not understood.
authors.affiliation: Quantronics Group, Service de Physique de l'État Condensé, CNRS, URA 2464, IRAMIS, CEA-Saclay, 91191 Gif-sur-Yvette, France.
authors.forename: M
authors.initials: M
authors.lastname: Zgirski
authors.forename: L
authors.initials: L
authors.lastname: Bretheau
authors.forename: Q
authors.initials: Q
authors.lastname: Le Masne
authors.forename: H
authors.initials: H
authors.lastname: Pothier
authors.forename: D
authors.initials: D
authors.lastname: Esteve
authors.forename: C
authors.initials: C
authors.lastname: Urbina