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Non-equilibrium supercurrent through mesoscopic ferromagnetic weak links | | Tero T. Heikkila
; Frank K. Wilhelm
; Gerd Schoen
; | | Date: |
23 Mar 2000 | | Journal: | Europhys. Lett. 51, 434 (2000). | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Superconductivity | cond-mat.mes-hall cond-mat.supr-con | | Affiliation: | 1 and 2), Frank K. Wilhelm (1 and 3), Gerd Schoen ( Institut fuer Theoretische Festkoerperphysik, Universitaet Karlsruhe, Materials Physics Laboratory, Helsinki University of Technology, Quantum Transport Group, TU Delft | | Abstract: | We consider a mesoscopic normal metal, where the spin degeneracy is lifted by a ferromagnetic exchange field or Zeeman splitting, coupled to two superconducting reservoirs. As a function of the exchange field or the distance between the reservoirs, the supercurrent through this device oscillates with an exponentially decreasing envelope. This phenomenon is similar to the tuning of a supercurrent by a non-equilibrium quasiparticle distribution between two voltage-biased reservoirs. We propose a device combining the exchange field and non-equilibrium effects, which allows us to observe a range of novel phenomena. For instance, part of the field-suppressed supercurrent can be recovered by a voltage between the additional probes. | | Source: | arXiv, cond-mat/0003383 | | Services: | Forum | Review | PDF | Favorites | |
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