Thursday, July 18, 2013

1307.4672 (A. Ozaeta et al.)

Huge thermoelectric effects in ferromagnet-superconductor junctions in
the presence of a spin-splitting field

A. Ozaeta, P. Virtanen, F. S. Bergeret, T. T. Heikkilä
We show that a huge thermoelectric effect can be observed by contacting a superconductor whose density of states is spin-split by a Zeeman field with a ferromagnet with a non-zero polarization. The resulting thermopower exceeds $k_B/e$ by a large factor, and the thermoelectric figure of merit $ZT$ can far exceed unity, leading to heat engine efficiencies close to the Carnot limit. We also show that spin-polarized currents can be generated in the superconductor by applying a temperature bias.
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