Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 38: Ultra-cold atoms, ions and BEC V (with Q)

A 38.4: Vortrag

Freitag, 4. März 2016, 11:45–12:00, f107

Tuning Static and Dynamic Properties of a Quasi One-Dimensional Bose-Einstein Condensate — •Javed Akram¹ and Axel Pelster² — ¹Physics Department, Freie Universität Berlin, Germany — ²Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany

Here we provide a detailed theoretical investigation in view of how to tune both static and dynamic properties of quasi one-dimensional confined Bose-Einstein condensates (BECs). At first we study ⁸⁷Rb atoms in a quasi one-dimensional trap geometry, which consists of a harmonic trap together with a red or blue-detuned Gaussian (Hermite-Gaussian) dimple trap [1,2]. After having switched off the dimple trap, shock-waves or gray pair-soliton (bi-)trains emerge, which oscillate with a characteristic frequency in the remaining harmonic trap. Afterwards, we analyze a quasi one-dimensional BEC in a nonlinear gravito-optical surface trap [3]. Studying a non-ballistic expansion of the BEC cloud, when the confining evanescent laser beam is shut off, turns out to agree quite well with results from a previous Innsbruck experiment. Finally, we investigate how the wave function of a trapped ⁸⁷Rb BEC changes due to the presence of a single ¹³³Cs impurity [4]. To this end, we determine the equilibrium phase diagram, which is spanned by the intra- and inter-species coupling strengths.

[1] J. Akram and A. Pelster, arXiv:1508.05482.

[2] J. Akram and A. Pelster, arXiv:1509.03826.

[3] J. Akram and A. Pelster, arXiv:1509.05987.

[4] J. Akram and A. Pelster, arXiv:1510.07138.