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- Strand, Hugo, 1983-, et al.
(författare)
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Nonequilibrium Dynamical Mean-Field Theory for Bosonic Lattice Models
- 2015
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Ingår i: Physical Review X. - : American Physical Society. - 2160-3308. ; 5:1
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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