A simple and very flexible variational approach to the out-of-equilibrium quantum dynamics in strongly correlated electron systems is introduced through a time-dependent Gutzwiller wave function. As an application, we study the simple case of a sudden change of the interaction in the fermionic Hubbard model and find at the mean-field level an extremely rich behavior. In particular, a dynamical transition between small and large quantum quench regimes is found to occur at half-filling, in accordance with the analysis of Eckstein et al., Phys. Rev. Lett. 103, 056403 (2009), obtained by dynamical mean-field theory, that turns into a crossover at any finite doping.
|Titolo:||Time-Dependent Mean Field Theory for Quench Dynamics in Correlated Electron Systems|
|Autori:||Schiro M; Fabrizio M|
|Rivista:||PHYSICAL REVIEW LETTERS|
|Data di pubblicazione:||2010|
|Digital Object Identifier (DOI):||10.1103/PhysRevLett.105.076401|
|Appare nelle tipologie:||1.1 Journal article|