Research

Breathing oscillations of a trapped impurity in a Bose gas


Reference:

Johnson, T. H., Bruderer, M., Cai, Y., Clark, S. R., Bao, W. and Jaksch, D., 2012. Breathing oscillations of a trapped impurity in a Bose gas. EPL (Europhysics Letters), 98 (2), 26001.

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    Official URL:

    http://dx.doi.org/10.1209/0295-5075/98/26001

    Abstract

    Motivated by a recent experiment [J. Catani et al., arXiv:1106.0828v1 preprint, 2011], 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, the degree of which can be engineered through controllable parameters. 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. Moreover, we predict novel effects at lower temperatures due to self-trapping and the inhomogeneity of the trapped Bose gas.

    Details

    Item Type Articles
    CreatorsJohnson, T. H., Bruderer, M., Cai, Y., Clark, S. R., Bao, W. and Jaksch, D.
    DOI10.1209/0295-5075/98/26001
    Uncontrolled Keywordscond-mat.quant-gas
    DepartmentsFaculty of Science > Physics
    RefereedYes
    StatusPublished
    ID Code47344
    Additional Information7 pages, 3 figures

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