Josephson current in unconventional superconductors through an Anderson impurity

Abstract

Josephson current for a system consisting of an Anderson impurity weakly coupled to two unconventional superconductors is studied and shown to be driven by a surface zero energy (mid-gap) bound-state. The repulsive Coulomb interaction in the dot can turn a $\pi$ junction into a 0-junction. This effect is more pronounced in p-wave superconductors while in high-temperature superconductors with $d_{x^2-y^2}$ symmetry it can exit for rather large artificial centers at which tunneling occurs within a finite region.

4 pages 3.eps figures

References in corpus (1)

• Impurity-Induced Bound Excitations on the Surface of Bi2Sr2CaCu2O8

Cited by in corpus (2)

• Quantum Dot between two Superconductors
• Broken Time-reversal Symmetry in Josephson Junction with an Anderson impurity and multi band superconductors