Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 102: Cold Atomic Gases - Poster Session

TT 102.2: Poster

Thursday, April 3, 2014, 15:00–19:00, P2

Quantum quench dynamics in the Bose-Bose resonance model — •Florian Dorfner and Fabian Heidrich-Meisner — Ludwig-Maximilian-University Munich

We study quantum quenches between the three phases of the Bose-Bose resonance model, a one-dimensional model of bosonic atoms and diatomic molecules interacting via resonant Feshbach-type interactions. The three phases are: (i) Mott insulator (MI), (ii) molecular condensate (MC) and (iii) atomic and molecular condensate (AC+MC) [1]. We are interested in the temporal evolution of optimal modes that are the eigenstates of the one-site reduced density matrix. We also investigate the distribution of weights by computing the associated von-Neumann entropy. The optimal mode spectra and weights are calculated using exact diagonalization. We find that for quenches from the AC+MC to the MC phase the optimal mode weights and spectra stay almost constant in time. For this quench, the number of particles of the two species is studied and found to be oscillating in time. This is understood by decomposing the starting state into the eigenstates of the quenched system showing that there is significant overlap with only two eigenstates. In other cases the optimal mode spectra and weights change more significantly.

Support from the DFG through FOR1807 is gratefully acknowledged.
S. Ejima, M. J. Bhaseen, M. Hohenadler, F. H. L. Essler, H. Fehske and B. D. Simons, PRL 106, 015303 (2011)