Electron-Phonon Coupled Materials in Nonequilibrium*

Advances in the capability of pump-probe spectroscopy experiments present the opportunity to explore the coupled degrees of freedom in complex materials, as well as to reveal novel nonequilibrium features. Since the electrons are pumped to high energy, it is a reasonable approximation to consider a model of electrons coupled to static phonons. We examine the case of the Holstein model and we present the results for an exact solution of time-resolved ARPES data for phonon mediated charge-density-wave systems. The calculations are able to run to long times and include all perturbative and intrinsic anharmonic effects. We compare these computational results to experiments.