Non-Lorentzian homogeneous lineshape in semiconductor quantum dots

Summary form only given. One basic information in light-matter interaction is the homogeneous line broadening of an optical transition, inversely proportional to its dephasing time. In this work we study the homogeneous broadening in InGaAs/GaAs and in CdSe/ZnSe quantum dots by measuring both decoherence times and lineshapes. We use time-resolved four-wave mixing on an inhomogeneously broadened dot ensemble, and single-dot photoluminescence spectroscopy.