Andreev quantum dot with several conducting channels

Details Andreev quantum dot with several conducting channels Andreev quantum dot with several conducting channels

2012-01-13

arxiv.org/abs/1201.2831v3

Phys. Rev. B 85, 125442 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 10 figures, minor corrections

Scientific paper

10.1103/PhysRevB.85.125442

We study an Andreev quantum dot, that is a quantum dot inserted in a superconducting ring, with several levels or conducting channels. We analyze the degeneracy of the ground state as a function of the phase difference and of the gate voltage and find its dependence on the Coulomb interaction within and between channels. We compute a (non integer) charge of the dot region and Josephson current. The charge-to-phase and current-to-gate voltage sensitivities are studied. We find that, even in the presence of Coulomb interaction between the channels, the sensitivity increases with the number of channels, although it does not scale linearly as in the case with no interactions. The Andreev quantum dot may therefore be used as a sensitive detector of magnetic flux or as a Josephson transistor.

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