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A: Fachverband Atomphysik
A 15: Poster I
A 15.27: Poster
Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster
daming in 2D and 3D dilute Bose gas — •Ming-Chiang Chung — Academia Sinica Taiwan
Damping in 2D and 3D dilute gases is investigated using both the hydrodynamical approach and the Hartree-Fock-Bogoliubov (HFB) approximation . We found that the both methods are good for the Beliaev damping at zero temperature and Landau damping at very low temperature, however, at high temperature, the hydrodynamical approach overestimates the Landau damping and the HFB gives a better approximation. This result shows that the comparison of the theoretical calculation using the hydrodynamical approach and the experimental data for high temperature done by Vincent Liu (PRL 21 4056 (1997)) is not proper. For two-dimensional systems, we show that the Beliaev damping rate is proportional to k3 and the Landau damping rate is proportional to T2 for low temperature and to T for high temperature. We also show that in two dimensions the hydrodynamical approach gives the same result for zero temperature and for low temperature as HFB, but overestimates the Landau damping for high temperature.