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ЖУРНАЛЫ // Письма в Журнал экспериментальной и теоретической физики // Архив

Письма в ЖЭТФ, 2003, том 78, выпуск 4, страницы 265–270 (Mi jetpl2526)

Эта публикация цитируется в 22 статьях

Superconducting spin filter

N. M. Shchelkachevab

a L. D. Landau Institute for Theoretical Physics, Russian Academy of Sciences
b Institute for High Pressure Physics, Russian Academy of Sciences

Аннотация: 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 $I_2(V_1,0)$ 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, $I_2(V_1,0)=0$, if $|V_1|<\Delta$ 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 $I_2(V_1,0)=0$ for general configuration of the normal leads; if the first lead injects spin polarized current then $I_2=0$, 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 $I_1(V_1,V_2), I_2(V_1,V_2)$.

PACS: 74.50.+r, 74.80.Fp, 75.75.+a

Поступила в редакцию: 14.07.2003

Язык публикации: английский


 Англоязычная версия: Journal of Experimental and Theoretical Physics Letters, 2003, 78:4, 230–235

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