The anisotropic exchange interaction (AEI) between electrons and holes is shown to play a central role in quantum dots (QDs) spin dynamics. In neutral QDs, AEI is at the origin of spin quantum beats observed under resonant excitation between the lowest energy doublet of linearly dipole-active eigenstates. In negatively charged QDs, AEI is at the origin of QD emission with opposite helicity to the optical excitation, under non-resonant excitation conditions. Finally, the possibility of leaving a spin information in the system after recombination of the photo-injected electron-hole pair is discussed with respect to the type and the level of the doping. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
|Number of pages||6|
|Journal||Physica Status Solidi C - Current Topics in Solid State Physics|
|Publication status||Published - 2005|