Strand, Hugo U. R. Eckstein, Martin Werner, Philipp 2015-03-30 We develop the nonequilibrium extension of bosonic dynamical mean-field theory and a Nambu real-time strong-coupling perturbative impurity solver. In contrast to Gutzwiller mean-field theory and strong-coupling perturbative approaches, nonequilibrium bosonic dynamical mean-field theory captures not only dynamical transitions but also damping and thermalization effects at finite temperature. We apply the formalism to quenches in the Bose-Hubbard model, starting from both the normal and the Bose-condensed phases. Depending on the parameter regime, one observes qualitatively different dynamical properties, such as rapid thermalization, trapping in metastable superfluid or normal states, as well as long-lived or strongly damped amplitude oscillations. We summarize our results in nonequilibrium “phase diagrams” that map out the different dynamical regimes. application/pdf https://folia.unifr.ch/global/documents/304372 https://folia.unifr.ch/documents/304372/files/wer_ndm.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevX.5.011038 info:eu-repo/semantics/openAccess License undefined Physical Review X. - 2015, vol. 5, no. 1, p. 011038 info:eu-repo/classification/udc/53 Nonequilibrium dynamical mean-field theory for bosonic lattice models http://purl.org/coar/resource_type/c_6501