Hannover 2003 – wissenschaftliches Programm

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Q: Quantenoptik

Q 48: Poster: Fallen und Kühlung

Q 48.7: Poster

Donnerstag, 27. März 2003, 16:30–18:30, Lichthof

Bose-Einstein condensation in magnetic micropotentials: Towards Josephson coupling — •Thorsten Schumm^1,2, Christine Aussibal¹, Jerôme Esteve¹, Isabelle Bouchoule¹, Christoph Westbrook¹, and Alain Aspect¹ — ¹Institut dOptique Théorique et Appliquée, Université Paris Sud, Bat. 503, 91403 Orsay — ²Physikalisches Institut Heidelberg, Philosophenweg 12, 69120 Heidelberg

Magnetic potentials created by miniaturised current carrying wires on surfaces (atom chips) have proven to be a powerful tool in recent experiments with Bose-Einstein condensates. High gradients and trap frequencies allow for fast evaporative cooling and significant simplification of the experimental apparatus.

Our approach consists in a single chamber setup, ⁸⁷Rb atoms are loaded from a pulsed source (dispenser) into a reflection MOT, transferred into a U-MOT created by wires on the chip and finally into a magnetic Z-trap which provides a Ioffe-Pritchard field configuration. Evaporative cooling is applied in order to reach the BEC phase transition. Several parallel Z-wires will allow for the creation of double well potentials with variable coupling and adjustable barrier height. The poster presents the different loading steps of the atom chip and the experimental status. Possible parameter sets for the observation of Josephson oscillations will be discussed.