Nonequilibrium dynamical mean-field theory for bosonic lattice models
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Strand, Hugo U. R.
Department of Physics, University of Fribourg, Switzerland
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Eckstein, Martin
Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, Germany
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Werner, Philipp
Department of Physics, University of Fribourg, Switzerland
Published in:
- Physical Review X. - 2015, vol. 5, no. 1, p. 011038
English
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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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/304372
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