Phonon-drag induced suppression of the Andreev hole current in superconducting niobium contacts

Details Phonon-drag induced suppression of the Andreev hole current in superconducting niobium contacts Phonon-drag induced suppression of the Andreev hole current in superconducting niobium contacts

2011-09-17

arxiv.org/abs/1109.3770v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures, submitted to Proceedings 26th International Conference on Low Temperature Physics

Scientific paper

We have investigated how the Andreev-reflection hole current at ballistic point contacts responds to a large bias voltage. Its strong suppression could be explained by the drag excerted by the non-equilibrium phonon wind generated by high-energy electrons flowing through the contact. The hole - phonon interaction leads to scattering lengths of the low-energetic holes down to 100\,nm, thereby destroying the coherent retracing of the electron path by the Andreev-reflected holes.

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