Abstract
We report systematic measurements of photoluminescence excitation spectra and dephasing times ${(T}_{2}'\mathrm{s})$ on various excited states of hundreds of individual quantum dots (QDs). From the variation of ${T}_{2}'\mathrm{s}$ with the energy separation between excited states and the ground state ${(E}_{\mathrm{rel}}),$ we identified two distinct regions of ${E}_{\mathrm{rel}}$ where LO phonon emission and hole relaxation via LA phonon emission play as dominat dephasing mechanisms. We also found a clear evidence of significantly slow energy relaxation in the ${E}_{\mathrm{rel}}$ range where these phonon emission processes are suppressed due to the reduction of interaction phase space.
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