Effect of point-contact transparency on the coherent mixing of Josephson and transport supercurrents

Abstract

The influence of electron reflection on dc Josephson effect in a ballistic point contact with transport current in the banks is considered theoretically. The effect of finite transparency on the vortexlike currents near the contact and at the phase difference φ=π, which has been predicted recently [Yu. A. Kolesnichenko, A. N. Omelyanchouk, and S. N. Shevchenko, Phys. Rev. B. 67 172504 (2003)], is investigated. We show that at low temperatures even a small reflection on the contact destroys the mentioned vortexlike current states, which can be restored by increasing the temperature. © 2004 The American Physical Society.