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 $I_c$ 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 $0$ state and the $\pi$ state of the SC/2DEG/SC junction as well. This $0$-$\pi$ 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.

5 pages, 5 figures

References in corpus (4)

• Tunneling anisotropic magnetoresistance and spin-orbit coupling in Fe/GaAs/Au tunnel junctions
• Mesoscopic Spin Hall Effect in Multiprobe Ballistic Spin-Orbit Coupled Semiconductor Bridges
• Josephson coupling through ferromagnetic heterojunctions with noncollinear magnetizations
• Josephson current through a quantum dot with spin-orbit coupling

Cited by in corpus (2)

• Spin-Hall effects in a Josephson contact
• Multiple Andreev reflections in a quantum dot coupled to superconductors: Effects of spin-orbit coupling