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Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2015

Nonequilibrium spin transport in Zeeman-split superconductors

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1
Manuel Houzet
Julia S. Meyer

Abstract

We investigate theoretically the nonlocal conductance through a superconducting wire in tunnel contact with normal and ferromagnetic leads. In the presence of an in-plane magnetic field, the superconducting density of states is spin split, and the current injected from the normal lead is spin polarized. A nonlocal conductance that is antisymmetric with the applied voltage can be measured with a ferromagnetic lead. It persists for a distance between the contacts that is larger than both the charge-imbalance relaxation length and the normal-state spin relaxation length. We determine its amplitude by considering two extreme models of weak and strong internal equilibration of the superconducting quasiparticles due to electron-electron interactions. We find that the nonlocal signal, which was measured in recent experiments and discussed as a spin-imbalance effect, can be interpreted alternatively as the signature of a thermoelectric effect.
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cea-01731485 , version 1 (09-04-2019)

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Tatiana Krishtop, Manuel Houzet, Julia S. Meyer. Nonequilibrium spin transport in Zeeman-split superconductors. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 91 (12), pp.121407. ⟨10.1103/PhysRevB.91.121407⟩. ⟨cea-01731485⟩
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