Josephson current through a ferromagnetic semiconductor/semiconductor/ferromagnetic semiconductor structure

We theoretically calculate the Josephson current for two superconductor/ferromagnetic semiconductor (SC/FS) bilayers separated by a semiconductor (SM) layer. It is found that the critical Josephson current I<Subscript>C</Subscript> in the junction is strongly determined by not only the relative orientations of the effective exchange field <InlineEquation ID="Equ1"> <EquationSource Format="TEX">${\bf h}$</EquationSource> </InlineEquation> of the two bilayers and scattering potential strengths at the interfaces but also the kinds of holes (the heavy or light) in the two FS layers. Furthermore, a robust approach to measuring the spin polarization P for the heavy and light holes is presented. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007