Quantifying electron-phonon coupling in CdTe1−xSex nanocrystals via coherent phonon manipulation

Abstract

We employ ultrafast transient absorption spectroscopy with temporal pulse shaping to manipulate coherent phonon excitation and quantify the strength of electron-phonon coupling in CdTe1−xSex nanocrystals (NCs). Raman active CdSe and CdTe longitudinal optical phonon (LO) modes are excited and probed in the time domain. By temporally controlling pump pulse pairs to coherently excite and cancel coherent phonons in the CdTe1−xSex NCs, we estimate the relative amount of optical energy that is coupled to the coherent CdSe LO mode.