Anisotropy of the electron Lande g factor in InAs/GaAs self-assembled quantum dots

We report on,the precise determination of the electron Lande g factor and its anisotropy in self-assembled InAs/GaAs quantum dots (QDs), by means of measurements of Larmor precession frequencies in photoinduced circular dichroism (PCD) experiments performed with an oblique magnetic field. This optical technique, applied to an ensemble of QDs, is able to measure the electronic g factor corresponding to ground-state electrons resident in QDs emitting at a given energy of fundamental optical transition. In good agreement with recent theoretical results, we measure vertical bar g(perpendicular to)vertical bar = 0.397 +/- 0.003 and vertical bar g(parallel to)vertical bar = 0.18 +/- 0.02 for QDs emitting at 1.32eV. (C) 2007 Elsevier B.V. All rights reserved.