Frankfurt 2006 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 49: Quantengase V
Q 49.5: Vortrag
Mittwoch, 15. März 2006, 16:30–16:45, HVI
Splitting and merging an elongated Bose condensate at finite temperature — •Alem Mebrahtu1, Anna Sanpera1,2, and Maciej Lewenstein1,3 — 1Institut für Theoretische Physik, Universität Hannover, Hannover, Germany — 2Grup de Física Teòrica, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain — 3ICFO-Institut de Ciències Fotòniques, E-08034 Barcelona, Spain
We analyze coherence effects during the splitting of a quasi one-dimensional condensate into two spatially separated ones and their subsequent merging into a single condensate. Our analysis takes into account finite temperature effects, where phase fluctuations play an important role. We show that, at zero emperature, the two split ccondensates can be merged into a single one with a negligible phase difference. By increasing temperature to a finite value below the critical point for condensation (Tc), i.e., 0 ≤ T/Tc <1, a considerable enhancement of phase and density fluctuations during the process of splitting and merging appears. Our results show that if the process of splitting and merging is sufficiently adiabatic, the whole process is quite insensitive to phase fluctuations and even at high temperatures, a single condensate can be produced.