Theory of charge transport in ferromagnetic semiconductor/s-wave superconductor junction

Details Theory of charge transport in ferromagnetic semiconductor/s-wave superconductor junction Theory of charge transport in ferromagnetic semiconductor/s-wave superconductor junction

2009-06-23

arxiv.org/abs/0906.4244v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 6 figures

Scientific paper

We study tunneling conductance in ferromagnetic semiconductor/insulator/s-wave superconductor junction where Rashba spin-orbit interaction (RSOI) and exchange field are taken into account in the ferromagnetic semiconductor. We show that normalized conductance at zero voltage has a maximum as a function of RSOI for high transparent interface and finite exchange field. This is because Andreev reflection probability shows a nonmonotonic dependence on RSOI in the presence of the exchange field. On the other hand, for intermediate transparent interface, normalized conductance at zero voltage has a reentrant shape at zero or small exchange field with increasing RSOI but is monotonically increasing by RSOI at large exchange field.

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