Virtanen P, Zou J, Sosnin I, Petrashov V T, Heikkilä T T
Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 3500, FIN-02015 TKK, Finland.
Phys Rev Lett. 2007 Nov 23;99(21):217003. doi: 10.1103/PhysRevLett.99.217003. Epub 2007 Nov 21.
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.
我们研究了一种具有四个超导接触的介观正常金属结构，其中两个接触形成一个回路。该结构在三种（亚）稳态之间发生转变，由非平衡条件触发不同的相位配置。这些转变导致磁阻发生显著变化。我们发现实验与基于准经典凯尔迪什形式理论之间存在定性的一致性。
