Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-10-29
Physics
Condensed Matter
Quantum Gases
4 pages, 6 figures. Intended for Physical Review Letters. We would be gratful for any comments/criticisms
Scientific paper
We explore the energy dynamics of a two dimensional (2D) harmonically trapped Bose-Einstein condensate inside a box potential, excited by a moving red-detuned laser potential (RDLP). For an RDLP velocity $v$ less than a critical value $v_c$, energy oscillations are observed to begin simultaneously with the motion of the RDLP. For $v > v_c$, these oscillations are delayed through a transient in the energy. At the end of the delay time $t_{ons}$, the energy oscillations are regenerated again, and $t_{ons}$ is found to depend on $v$ through universal relations for two cases: one for an RDLP depth sufficient to break off a BEC fragment, another for a depth insufficient to split the BEC. In the case of splitting, $t_{ons}$ exactly equals the time it takes the BEC fragment (dragged by the RDLP trough) to reach the hard wall of the box potential.
Sakhel Asaad R.
Sakhel Roger R.
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