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Fully spin-dependent boundary condition for isotropic quasiclassical Green's functions

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2015

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http://arxiv.org/abs/1502.05567

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Transport in superconducting heterostructures is very successfully described with quasiclassical Green's functions augmented by microscopically derived boundary conditions. However, so far the spin-dependence is in the diffusive approach included only for limiting cases. Here, we derive the fully spin-dependent boundary condition completing the Usadel equation and the circuit theory. Both, material specific spin-degrees of freedom and spin-dependent interface effects, i.e. spin-mixing and polarization of the transmission coefficients are treated exactly. This opens the road to accurately describe a completely new class of mesoscopic circuits including materials with strong intrinsic magnetic structure. We also discuss several experimentally relevant cases like the tunnel limit, a ferromagnetic insulator with arbitrarily strong magnetization and the limit of small spin-mixing.

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ISO 690MACHON, Peter, Wolfgang BELZIG, 2015. Fully spin-dependent boundary condition for isotropic quasiclassical Green's functions
BibTex
@unpublished{Machon2015Fully-31007,
  year={2015},
  title={Fully spin-dependent boundary condition for isotropic quasiclassical Green's functions},
  author={Machon, Peter and Belzig, Wolfgang}
}
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