Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 2 (jointly with DY)
TT 19.7: Vortrag
Montag, 16. März 2015, 16:45–17:00, H 3010
Real-time dynamics of lattice bosons from nonequilibrium dynamical mean-field theory — •Hugo Strand1, Martin Eckstein2, and Philipp Werner1 — 1Department of Physics, University of Fribourg, Fribourg, Switzerland — 2Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, Hamburg, Germany
We extend bosonic dynamical mean-field theory to nonequilibrium situations in combination with a Nambu strong coupling impurity solver [1]. As a first application we study bosonic cold-atoms in an optical lattice using the Bose-Hubbard model and investigate the Mott insulating, superfluid and normal phases at finite temperatures. We perturb the system by quenching the interaction, mimicking the seminal experiment of Greiner et al. [2], and study its time-evolution. Starting from both the normal and superfluid phase, we map out non-equilibrium phase diagrams of the different dynamical regimes, such as rapid thermalization, and trapping in meta-stable normal and superfluid states. Depending on parameters, the condensate displays long lived or strongly damped amplitude oscillations. Nonequilibrium bosonic dynamical mean-field theory can directly be extended to nonequilibrium bosonic multi-component systems [3] and Bose-Fermi mixtures [4].
[1] HS, ME, PW arXiv:1405.6941.
[2] M. Greiner, O. Mandel, T. W. Hansch, I. Bloch,
Nature 419, 51 (2002).
[3] A. Hubener, M. Snoek, W. Hofstetter, PRB 80, 245109 (2009).
[4] P. Anders, P. Werner, M. Troyer, M. Sigrist, L. Pollet,
PRL 109, 206401 (2012).