Transport properties of a quantum dot with superconducting leads

Details Transport properties of a quantum dot with superconducting leads Transport properties of a quantum dot with superconducting leads

1996-07-15

arxiv.org/abs/cond-mat/9607095v1

Phys. Rev. B 54, 5255 (1996).

Physics

Condensed Matter

11 pages, 3 PostScript figures. To appear in Phys. Rev. B (Rapid Comm.)

Scientific paper

10.1103/PhysRevB.54.R5255

We report a numerical study of transport properties of a quantum dot with superconducting leads. We introduce a general phenomenological model of quantum dot transport, in which electron tunnel rates are computed within the Fermi's Golden Rule approach. The low temperature current-voltage (I-V) characteristics are in qualitative agreement with experimental observations of Ralph et al. [Phys. Rev. Lett., 74, 3241 (1995)]. At higher temperatures, our results reveal new effects due to the thermal excitation of quasiparticles in the leads as well as the thermal population of excited quantum levels in the dot. We also study the photon-assisted tunneling phenomena in our system and point out its potential for millimeter wave applications.

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