Thermo-spin effects in a quantum dot connected to ferromagnetic leads

Details Thermo-spin effects in a quantum dot connected to ferromagnetic leads Thermo-spin effects in a quantum dot connected to ferromagnetic leads

2008-11-20

arxiv.org/abs/0811.3265v2

Phys. Rev. B. 79, 081302(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, published version (PRB rapid)

Scientific paper

10.1103/PhysRevB.79.081302

We study a system composed of a quantum dot in contact with ferromagnetic leads, held at different temperatures. Spin analogues to the thermopower and thermoelectric figures of merit are defined and studied as a function of junction parameters. It is shown that in contrast to bulk ferromagnets, the spin thermopower coefficient in a junction can be as large as the Seebeck coefficient, resulting in a large spin figure of merit. In addition, it is demonstrated that the junction can be tuned to supply only spin current but no charge current. We also discuss experimental systems where our predictions can be verified.

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