Nonequilibrium dynamical mean-field theory for bosonic lattice models
- Strand, Hugo U. R. Department of Physics, University of Fribourg, Switzerland
- Eckstein, Martin Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, Germany
- Werner, Philipp Department of Physics, University of Fribourg, Switzerland
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30.03.2015
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.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 255971
- DOI 10.1103/PhysRevX.5.011038
- Persistent URL
- https://folia.unifr.ch/unifr/documents/304372
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