2003/06/30 by N. M. Chtchelkatchev · 1 citation
Physics and Astronomy · #Quantum and electron transport phenomena #Rare-earth and actinide compounds #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.supr-con
paper · pdf · doi:10.1134/1.1622037
published as JETP Lett. v. 78, 230 (2003). [Pis'ma v Zh. Eksp. i Teor. Fiz. v. 78, 265 (2003).] · 5 pages, references added
openalex publication_date 2003/08/01 · arxiv created 2003/10/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 grounded lead 2; its magnitude depends on the competition between processes of Andreev and normal quasiparticle transmission from lead 1 to 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 |<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 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 lead 2 is finite. A 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 ).