Tuesday, May 21, 2013

1305.4594 (A. Rancon et al.)

Quench Dynamics in Bose condensates in the Presence of a Bath: Theory
and Experiment

A. Rancon, Cheng-Lung Hung, Cheng Chin, K. Levin
In this paper we study the transient dynamics of a Bose superfluid subsequent to an interaction quench. Essential for equilibration is a source of dissipation which we include following the approach of Caldeira and Leggett. Here we solve the equations of motion exactly by integrating out an environmental bath. We thereby derive precisely the time dependent density correlation functions with the appropriate analytic and asymptotic properties. The resulting structure factor exhibits the expected damping and thereby differs from that of strict Bogoliubov theory. These damped sound modes, which reflect the physics beyond mean field approaches, are characterized and the structure factors are found to compare favorably with experiment.
View original: http://arxiv.org/abs/1305.4594

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