Year: 1999
Type: article
Abstract: 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 $\ensuremath{\delta}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{\pi}$ 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 $\ensuremath{\delta}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ and $\ensuremath{\delta}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{\pi}$ is stable while the other is metastable, with the energy $E(\ensuremath{\delta})$ having a kink somewhere in between. As a consequence of the kink, the $I\ensuremath{-}V$ characteristics of the junction are modified at low voltages.
Source: Physical Review Letters
Authors: A. V. Rozhkov, Daniel P. Arovas
Institution: University of California San Diego
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1481704295