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SUMMARY:Dynamics of Feshbach Resonances in Ultra-Cold Gases
DESCRIPTION:Very large scattering lengths can be achieved using Feshbach resonances, but at the
cost of introducing quite slow time scales. For example, in Bragg Scattering from a
Feshbach-enhanced BEC, effects are observed [1] which cannot be explained by any
conventional model—that is, anymodelwhich assumes that the interactions in such
a BEC can be modelled by a contact interaction employing the Feshbach enhanced
scattering length. To get agreement with experiment, the dynamics of the Feshbach
resonance must be included [2], since the time scale of the Bragg scattering can be
faster than the time scale of the molecular bound states involved in the Feshbach
resonance.
In this informal talk, I will discuss
• How to model the full dynamics of Fesbach enhanced BECs, with particular
attention to situations in which the dynamics of the BEC can become important.
• How it appears that the point at which the cross-section vanishes corresponds
to very slow dynamics, and therefore requires careful modelling.
• How effective three-body forces can arise within such a framework.
References
[1] S. B. Papp, J. M. Pino, R. J. Wild, S. Ronen, C. E. Wieman, D. S. Jin, and E. A. Cornell,
Bragg Spectroscopy of a Strongly Interacting 85Rb Bose–Einstein Condensate,
Phys. Rev. Lett. 101, 135301 (2008).
[2] C. E. Sahlberg, R. J. Ballagh, and C. W. Gardiner, Dynamic Effects of a Feshbach
Resonance on Bragg Scattering from a Bose–Einstein Condensate, Phys. Rev. A 87,
043621 (2013).

LOCATION:Erwin-Schödinger-Saal, IQOQI
DTSTART:20160125T133000
DTEND:20160125T143000
TZID: Europe/Vienna
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