Charge transport through ferromagnet/two-dimensional electron gas/d-wave superconductor junctions with Rashba spin-orbit coupling
Department of Physics, Nanjing University, Nanjing, 210093, P.R. China
Corresponding author: a email@example.com
Revised: 28 April 2008
Published online: 6 June 2008
Along the lines of Blonder, Tinkham and Klapwijk, we investigate the charge transport through ferromagnet/two-dimensional electronic gas/d-wave superconductor (F/2DEG/S) junctions in the presence of Rashba spin-orbit (SO) coupling and focus our attention on the interplay between spin polarization and spin precession. At zero spin polarization, the spin-mixing scattering resulted from Rashba SO coupling decreases the zero-bias conductance peak. Under spin polarization, spin precession introduces novel Andreev reflection, which competes with the effect of spin-mixing scattering. If the F layer is a half metal, the later effect is overwhelmed by that of novel Andreev reflection. As a result, the zero-bias conductance dip caused by spin polarization is enhanced, and at strong Rashba SO coupling, a split zero-bias peak is found in the gap. In an intermediate region where the two effects are comparable with each other, the zero-bias conductance shows a reentrant behavior as a function of Rashba SO coupling.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 74.45.+c – Proximity effects; Andreev effect; SN and SNS junctions / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 74.20.Rp – Pairing symmetries
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008