Electron-phonon dynamics in an ensemble of nearly isolated nanoparticles -art. no. 115412

We investigate the electron population dynamics in an ensemble of nearly is olated insulating nanoparticles, each nanoparticle modeled as an electronic two-level system coupled to a single vibrational mode. We find that at sho rt times the ensemble-averaged excited-state population oscillates but has a decaying envelope. At long times, the oscillations become purely sinusoid al about a "plateau" population, with a frequency determined by the electro n-phonon interaction strength and with an envelope that decays algebraicall y as t(-1/2). We use this theory to predict electron-phonon dynamics in an ensemble Of Y2O3: Eu3+ nanoparticles.