Exciton-LO phonon dynamics in InAs/GaAs quantum dots: Effects of zone-edge phonon damping

摘要

The dynamics of an exciton-LO phonon system after an ultrafast optical excitation in an InAs/GaAs quantum dot is studied theoretically. Influence of anharmonic phonon damping and its interplay with the phonon dispersion is analyzed. The signatures of the zone-edge decay process in the absorption spectrum and time evolution are highlighted, providing a possible way of experimental investigation on phonon anharmo-nicity effects.