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VOLUME 78 | ISSUE 4 | PAGE 265
Superconducting spin filter
N. M. Chtchelkatchev

L. D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia
Institute for High Pressure Physics, Russian Academy of Sciences 142092 Troitsk, Moscow Region, Russia


PACS: 74.50.+r, 74.80.Fp, 75.75.+a
Abstract
Consider two normal leads coupled to a superconductor; the first lead is biased while the second one and the superconductor are grounded. In general, a finite current I2(V1,0) is induced in the grounded lead 2; its magnitude depends on the competition between processes of Andreev and normal quasiparticle transmission from the lead 1 to the lead 2. It is known that in the tunneling limit, when normal leads are weakly coupled to the superconductor, I2(V1,0)=0, if |V1|<Δ and the system is in the clean limit. In other words, Andreev and normal tunneling processes compensate each-other. We consider the general case: the voltages are below the gap, the system is either dirty or clean. It is shown that I2(V1,0)=0 for general configuration of the normal leads; if the first lead injects spin polarized current then I2=0, but spin current in the lead-2 is finite. XISIN structure, where X is a source of the spin polarized current could be applied as a filter separating spin current from charge current. We do an analytical progress calculating I1(V1,V2), I2(V1,V2).


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