Nonequilibrium Dynamical Mean-Field Theory for Bosonic Lattice Models

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

Funding Agency:FP7 ERC starting Grant 278023
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.

Eckstein, MartinMax Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, Hamburg, Germany (författare)
Werner, PhilippDepartment of Physics, University of Fribourg, Fribourg, Switzerland (författare)
Department of Physics, University of Fribourg, Fribourg, SwitzerlandMax Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, Hamburg, Germany (creator_code:org_t)

Av författaren/redakt...: Strand, Hugo, 19 ...; Eckstein, Martin; Werner, Philipp

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