Charge Pumping in Mesoscopic Systems coupled to a Superconducting Lead

Details Charge Pumping in Mesoscopic Systems coupled to a Superconducting Lead Charge Pumping in Mesoscopic Systems coupled to a Superconducting Lead

2002-04-16

arxiv.org/abs/cond-mat/0204340v1

Phys. Rev. B 65, 235318 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.65.235318

We derive a general scattering-matrix formula for the pumped current through a mesoscopic region attached to a normal and a superconducting lead. As applications of this result we calculate the current pumped through (i) a pump in a wire, (ii) a quantum dot in the Coulomb blockade regime, and (iii) a ballistic double-barrier junction, all coupled to a superconducting lead. Andreev reflection is shown to enhance the pumped current by up to a factor of 4 in case of equal coupling to the leads. We find that this enhancement can still be further increased for slightly asymmetric coupling.

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