Nonequilibrium Dynamical Mean-Field Theory for Bosonic Lattice Models

Strand, Hugo, 1983- (author): Department of Physics, University of Fribourg, Fribourg, Switzerland

Eckstein, Martin (author): Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, Hamburg, Germany

Werner, Philipp (author): Department of Physics, University of Fribourg, Fribourg, Switzerland

(creator_code:org_t)

Related links:: https://doi.org/10.1...; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

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.

By the author/editor: Strand, Hugo, 19 ...; Eckstein, Martin; Werner, Philipp

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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