Very high precision measurements of the electron Lande g-factor in GaAs are presented using spin-quantum beat spectroscopy at low excitation densities and temperatures ranging from 2.6 to 300 K. In colligation with available data for the temperature dependent effective mass a temperature dependence of the interband matrix element within a common five level kp-theory can model both parameters consistently. A strong decrease of the interband matrix element with increasing temperature consistently closes a long lasting gap between experiment and theory and substantially improves the modeling of both parameters.
@article{arxiv.cond-mat/0608534,
title = {Temperature dependent Electron Land\'e g-Factor and Interband Matrix Element in GaAs},
author = {J. Hübner and S. Döhrmann and D. Hägele and M. Oestreich},
journal= {arXiv preprint arXiv:cond-mat/0608534},
year = {2009}
}