Stuttgart 2012 – wissenschaftliches Programm
Q 32.5: Vortrag
Dienstag, 13. März 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.  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.  despite experimental thermal effects, and are supported by simulations of the system in the Gross-Pitaevskii regime.
 J. Catani et al., Quantum dynamics of impurities in a 1D Bose gas, arXiv:1106.0828v1 preprint (2011)