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Q: Quantenoptik und Photonik
Q 8: Quantengase II
Q 8.5: Vortrag
Montag, 13. März 2006, 15:00–15:15, HVI
Rotating Bose-Einstein Condensates in Anharmonic Traps — •Sebastian Kling1 and Axel Pelster2 — 1Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Fachbereich Physik, Universität Duisburg-Essen, Universitätsstraße 5, 45117 Essen, Germany
We study a Bose gas within a rotating anharmonic trap in the corotating frame. In the fast rotating regime, interesting physics takes place, since the centrifugal force overcompensates the harmonic confinement, so the trapping potential becomes Mexican-hat shaped. We calculate the eigenfrequencies of the vortex-free condensate at zero temperature for low energy excitations and the velocity profile after switching off the trap. Furthermore, we discuss how thermodynamic properties such as the critical temperature and the heat capacity of the Bose gas depend on the rotation frequency.