Andreev Current-Induced Dissipation in a Hybrid Superconducting Tunnel Junction

Details Andreev Current-Induced Dissipation in a Hybrid Superconducting Tunnel Junction Andreev Current-Induced Dissipation in a Hybrid Superconducting Tunnel Junction

2008-02-18

arxiv.org/abs/0802.2427v2

Physical Review Letters 100 (2008) 207002

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.100.207002

We have studied hybrid superconducting micro-coolers made of a double Superconductor-Insulator-Normal metal tunnel junction. Under subgap conditions, the Andreev current is found to dominate the single-particle tunnel current. We show that the Andreev current introduces additional dissipation in the normal metal equivalent to Joule heating. By analyzing quantitatively the heat balance in the system, we provide a full description of the evolution of the electronic temperature with the voltage. The dissipation induced by the Andreev current is found to dominate the quasiparticle tunneling-based cooling over a large bias range.

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