Energy relaxation in CdSe/ZnSe quantum dots under the strong exciton-phonon coupling regime

摘要

Resonant photoluminescence and photoluminescence excitation spectroscopy have been applied to CdSe/ZnSe quantum dots where separation between the quantized levels is close to the optical phonon energy. A strong relaxation enhancement induced by the optical phonon is observed. The fine structure of the phonon replicas is resolved. It is attributed to the optical phonons with large wave vectors from the symmetrical points of the Brillouin zone.