Giant thermoelectric effects in a proximity-coupled superconductor-ferromagnet device

Machon, Peter; Eschrig, Matthias; Belzig, Wolfgang

Giant thermoelectric effects in a proximity-coupled superconductor-ferromagnet device

Dateien

Machon_268314.pdfGröße: 6.49 MBDownloads: 214

Datum

2014

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Preprint

Publikationsstatus

Published

Zusammenfassung

The usually negligibly small thermoelectric effects in superconducting heterostructures can be boosted dramatically due to the simultaneous effect of spin splitting and spin filtering. Building on an idea of our earlier work [Phys. Rev. Lett. 110, 047002 (2013)], we propose realistic mesoscopic setups to observe thermoelectric effects in superconductor heterostructures with ferromagnetic interfaces or terminals. We focus on the Seebeck effect being a direct measure of the local thermoelectric response and find that a thermopower of the order of ∼200 μV/K can be achieved in a transistor-like structure, in which a third terminal allows to drain the thermal current. A measurement of the thermopower can furthermore be used to determine quantitatively the spin-dependent interface parameters that induce the spin splitting. For applications in nanoscale cooling we discuss the figure of merit for which we find enormous values exceeding 1 for temperature ≲1K.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

MACHON, Peter, Matthias ESCHRIG, Wolfgang BELZIG, 2014. Giant thermoelectric effects in a proximity-coupled superconductor-ferromagnet device

BibTex

@unpublished{Machon2014Giant-26831,
  year={2014},
  title={Giant thermoelectric effects in a proximity-coupled superconductor-ferromagnet device},
  author={Machon, Peter and Eschrig, Matthias and Belzig, Wolfgang}
}

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Universitätsbibliographie

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