Phase states of multiterminal mesoscopic normal-metal-superconductor structures |
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Authors: | Virtanen P Zou J Sosnin I Petrashov V T Heikkilä T T |
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Institution: | Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 3500, FIN-02015 TKK, Finland. |
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Abstract: | We study a mesoscopic normal-metal structure with four superconducting contacts, two of which are joined into a loop. The structure undergoes transitions between three (meta)stable states, with different phase configurations triggered by nonequilibrium conditions. These transitions result in spectacular changes in the magnetoresistance. We find a qualitative agreement between the experiments and a theory based on the quasiclassical Keldysh formalism. |
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