Coherent quantum transport in two-dimensional electron gas/superconductor double junctions with Rashba spin-orbit coupling
Department of Physics, Beijing Normal University, Beijing 100875, P.R. China
Corresponding author: a firstname.lastname@example.org
Revised: 13 July 2008
Published online: 9 August 2008
Based on the extended Blonder-Tinkham-Klapwijk (BTK) approach, we have investigated the coherent quantum transport in two-dimensional electron gas/superconductor (2DEG/SC) double tunneling junctions in the presence of the Rashba spin-orbit coupling (RSOC). It is found that all the reflection coefficients in BTK theory as well as conductance spectra oscillate with the external voltage and energy. The oscillation feature of conductance can be tuned largely by the RSOC for low insulating barriers, while for high insulating barriers it is almost independent of the RSOC. These phenomena are essentially different from those found in ferromagnet/superconductor double tunneling junctions.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 72.25.Mk – Spin transport through interfaces / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008