Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 32: Ultra-cold atoms, ions and BEC I
Q 32.5: Talk
Tuesday, March 13, 2012, 15:15–15:30, V7.02
Breathing oscillations of a trapped impurity in a Bose gas — •Martin Bruderer1, Tomi Johnson2, and Dieter Jaksch2 — 1Universität Konstanz — 2University of Oxford
Motivated by a recent experiment of Catani et al. [1] we study breathing oscillations in the width of a harmonically trapped impurity interacting with a separately trapped Bose gas. We provide an intuitive physical picture of such dynamics at zero temperature, using a time-dependent variational approach. In the Gross-Pitaevskii regime we obtain breathing oscillations whose amplitudes are suppressed by self-trapping due to interactions with the Bose gas. Introducing phonons in the Bose gas leads to the damping of breathing oscillations and non-Markovian dynamics of the width of the impurity. Our results reproduce the main features of the impurity dynamics observed by Catani et al. [1] despite experimental thermal effects, and are supported by simulations of the system in the Gross-Pitaevskii regime.
[1] J. Catani et al., Quantum dynamics of impurities in a 1D Bose gas, arXiv:1106.0828v1 preprint (2011)