Evidence for long-lived quasiparticles trapped in superconducting point contacts

Details Evidence for long-lived quasiparticles trapped in superconducting point contacts Evidence for long-lived quasiparticles trapped in superconducting point contacts

2011-05-25

arxiv.org/abs/1105.5039v4

Phys. Rev. Lett. 106, 257003 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

10.1103/PhysRevLett.106.257003

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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