Exciton fine structures and spin relaxation in semiconductor quantum dots

Summary form only given. Recently, the /spl mu/-photoluminescence spectroscopy or near-field scanning optical microscopy revealed polarization-dependent doublet structures of excitons with fine splitting of about several tens of /spl mu/eV as well as a very narrow linewidth of the same order of magnitude. A localized exciton at a monolayer-high island in narrow quantum wells (QWs) can be regarded as a weakly confined quantum dot (QD)-like state. It was found that the interface of a QW has island-like structures elongated along the [1~10] direction. The photoluminescence (PL) and PL excitation spectra show a fine splitting between two polarized components along [110] and [1~10] directions.