Kinky Behavior in Josephson Junctions

Details Kinky Behavior in Josephson Junctions Kinky Behavior in Josephson Junctions

1998-12-05

arxiv.org/abs/cond-mat/9812085v3

Phys. Rev. Lett. 82, 2788 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 7 encapsulated PostScript figures; figure 3 corrected

Scientific paper

10.1103/PhysRevLett.82.2788

We analyze nonperturbatively the behavior of a Josephson junction in which two BCS superconductors are coupled through an Anderson impurity. We recover earlier perturbative results which found that a $\delta=\pi$ phase difference is preferred when the impurity is singly occupied and the on-site Coulomb interaction is large. We find a novel intermediate phase in which one of $\delta=0$ and $\delta=\pi$ is stable while the other is metastable, with the energy $E(\delta)$ having a kink somewhere in between. As a consequence of the kink, the $I-V$ characteristics of the junction are modified at low voltages.

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