Two-color photoluminescence excitation spectroscopy ofInGaAs self-assembled quantum dots

摘要

Photoluminescence excitation (PLE) resonances in single self-assembled quantumrndots (SAQDs) are investigated. Two-color PLE reduce the contribution of the continuumrnstates and change the spectrum depending on each resonance. Some of resonant peaks showrnthe strong reduction of PLE intensities indicates the fact that the PLE continuum of SAQDsrnincludes large relaxation windows by way of optical phonon emissions. The reduction ofrntransitions thorough continuum states enables us to evaluate the PLE resonances with sharprnlinewidth.