Wednesday, July 31, 2013

1307.8096 (Philipp Werner et al.)

Phonon-enhanced relaxation and excitation in the Holstein-Hubbard model    [PDF]

Philipp Werner, Martin Eckstein
We study quenches of the interaction and electron-phonon coupling parameter in the Hubbard-Holstein model, using nonequilibrium dynamical mean field theory. The calculations are based on a generalized Lang-Firsov scheme for time-dependent interactions or externally driven phonons, and an approximate strong-coupling impurity solver. The interaction quench calculations reveal the phonon-assisted decay of excess doublons, while the quenches of the electron-phonon coupling lead to persistent oscillations of the phonons and to a phonon-enhanced doublon production.
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