Probing the exchange field of a quantum-dot spin valve by a superconducting lead

Details Probing the exchange field of a quantum-dot spin valve by a superconducting lead Probing the exchange field of a quantum-dot spin valve by a superconducting lead

2010-06-10

arxiv.org/abs/1006.1976v2

Phys. Rev. B. 82, 094514 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

published version, 10 pages, 7 figures

Scientific paper

10.1103/PhysRevB.82.094514

Electrons in a quantum-dot spin valve, consisting of a single-level quantum dot coupled to two ferromagnetic leads with magnetizations pointing in arbitrary directions, experience an exchange field that is induced on the dot by the interplay of Coulomb interaction and quantum fluctuations. We show that a third, superconducting lead with large superconducting gap attached to the dot probes this exchange field very sensitively. In particular, we find striking signatures of the exchange field in the symmetric component of the supercurrent with respect to the bias voltage applied between the ferromagnets already for small values of the ferromagnets' spin polarization.

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