Charge transport through ferromagnet/two-dimensional
electron gas/d-wave superconductor junctions with Rashba
spin-orbit coupling |
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Authors: | Z-Y Zhang |
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Institution: | (1) Department of Physics, Nanjing University, Nanjing, 210093, P.R. China |
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Abstract: | 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. |
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Keywords: | PACS" target="_blank">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 |
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