Importance of biexcitonic scattering in exciton dephasing in quantum dots

Summary form only given. The mechanism of exciton dephasing was clarified in zero-dimensional(0-D) InGaAs quantum dots by high-energy resolution single dot spectroscopy. We measured the exciton dephasing time from homogenous linewidth of excited levels of an exciton in an isolated quantum dot. Although the exciton acoustic phonon scattering has been believed to be the origin of the dephasing so far, we found that the biexcitonic scattering plays an very important role in the dephasing. This is a distinct feature of the 0-D quantum dot structure which has never been observed in 3-D, 2-D and 1-D structures.