State-Resolved Exciton−Phonon Couplings in CdSe Semiconductor Quantum Dots

The first observation of state-resolved exciton−phonon couplings are reported for the lowest four eigenstates in strongly confined colloidal quantum dots for both optical and acoustic phonons. State-resolved pump/probe experiments show that the excitonic eigenstate has a strong influence upon the Frohlich coupling to optical phonons and a moderate influence on the deformation potential coupling to acoustic phonons. These experiments provide a general approach to measuring exciton−phonon couplings in quantum dots with eigenstate-specificity.