Spin splitting in pseudomorphicInxGa1−xAs/InyAl1−yAsgraded heterostructures

Abstract

We have measured the spin splitting in the whole magnetic-field range in an ${\mathrm{In}}_{0.80}{\mathrm{Ga}}_{0.20}{\mathrm{A}\mathrm{s}/\mathrm{I}\mathrm{n}}_{0.53}{\mathrm{Ga}}_{0.47}{\mathrm{A}\mathrm{s}/\mathrm{I}\mathrm{n}}_{0.52}{\mathrm{Al}}_{0.48}\mathrm{As}$ graded heterostructure, and found that the spin splitting did not go to zero at any magnetic field, in agreement with recent theoretical predictions. A zero-field spin splitting of $3.82\ifmmode\pm\else\textpm\fi{}0.09\mathrm{meV}$ and an effective g factor as a function of magnetic field are deduced.