Electron g factor in quantum wells determined by spin quantum beats

Abstract Spin quantum beats are detected inGa/AsAl x Ga 1−x Asquantum wells in a magnetic field perpendicular to the growth direction by picosecond time-resolved photoluminescence spectroscopy. We directly determine the electron Lande´g factor as a function of well width from 1 to 20 nm with unprecedented accuracy which makes quantitative comparison with theory possible.