Effect of quantum confinement on exciton-phonon interactions

Exciton dephasing via phonon interactions in InAs quantum dots: Dependence on quantum confinement

We report systematic measurements of the dephasing of the excitonic ground-state transition in a series of InGaAs/GaAs quantum dots having different quantum confinement potentials. Using a highly sensitive fourwave mixing technique, we measure the polarization decay in the temperature range from 5 to 120 K on nine samples having the energy distance from the dot ground-state transition to the we...

Exciton-exciton and exciton-phonon interactions in an interfacial GaAs quantum dot ensemble

G. Moody,1,2 M. E. Siemens,1,* A. D. Bristow,1,† X. Dai,1,‡ D. Karaiskaj,1,§ A. S. Bracker,3 D. Gammon,3 and S. T. Cundiff1,2,‖ 1JILA, University of Colorado & National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA 2Department of Physics, University of Colorado, Boulder, Colorado 80309-0390, USA 3Naval Research Laboratory, Washington, DC 20375, USA (Received 2 August ...

Effect of phonon-phonon interactions on localization.

We study the heat current J in a classical one-dimensional disordered chain with on-site pinning and with ends connected to stochastic thermal reservoirs at different temperatures. In the absence of anharmonicity all modes are localized and there is a gap in the spectrum. Consequently J decays exponentially with system size N. Using simulations we find that even a small amount of anharmonicity ...

Exciton–Phonon Interactions in Molecular Crystals

Energy transfer in finite-size exciton-phonon systems: confinement-enhanced quantum decoherence.

Based on the operatorial formulation of the perturbation theory, the exciton-phonon problem is revisited for investigating exciton-mediated energy flow in a finite-size lattice. Within this method, the exciton-phonon entanglement is taken into account through a dual dressing mechanism so that exciton and phonons are treated on an equal footing. In a marked contrast with what happens in an infin...