Spin-orbital coupling effect on Josephson current through a superconductor heterojunction
Abstract
We study spin-orbital coupling effect on the Josephson current through a superconductor (SC) heterojunction, consisting of two s-wave superconductors and a two-dimensional electron gas (2DEG) layer between them. The Rashba-type (RSOC) and/or Dresselhaus-type (DSOC) of spin-orbital coupling are considered in the 2DEG region. By using the lattice Bogoliubov-de Gennes equation and the Keldysh formalism, we calculate the DC supercurrent flowing through the junction and find that the critical current exhibits a damped oscillation with both the strength of SOC and the layer length of 2DEG; especially, the strength ratio between RSOC and DSOC can also induce switching between the state and the state of the SC/2DEG/SC junction as well. This - transition results from the fact that SOC in a two-dimension system can lead to a pseudo-magnetic effect on the flowing electrons like the effect of a ferromagnet, since the time reversal symmetry of the system has already been broken by two SC leads with different macroscopic phases.
Cite
@article{arxiv.0801.1145,
title = {Spin-orbital coupling effect on Josephson current through a superconductor heterojunction},
author = {Z. H. Yang and Y. H. Yang and J. Wang and K. S. Chan},
journal= {arXiv preprint arXiv:0801.1145},
year = {2009}
}
Comments
5 pages, 5 figures