Volume 84, Number 4, November 2008
Article Number 40011
Number of page(s) 5
Section General
Published online 17 November 2008
EPL, 84 (2008) 40011
DOI: 10.1209/0295-5075/84/40011

Interaction-induced trapping and pulsed emission of a magnetically insensitive Bose-Einstein Condensate

S. Middelkamp1, I. Lesanovsky2 and P. Schmelcher1, 3

1   Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg - INF 229, 69120 Heidelberg, Germany, EU
2   Institut für Theoretische Physik, Universität Innsbruck - Innsbruck, Austria, EU
3   Physikalisches Institut, Universität Heidelberg - Philosophenweg 12, 69120 Heidelberg, Germany, EU

received 22 July 2008; accepted in final form 16 October 2008; published November 2008
published online 17 November 2008

We demonstrate that atoms in magnetically insensitive hyperfine states (m = 0) can be trapped efficiently by a Bose-Einstein Condensate of the same atomic species occupying a different hyperfine state. The latter is trapped magnetically. Hyperfine-state–changing collisions, and therefore loss of the trapped (m = 0) atoms, are shown to be strongly inhibited in case of a low density of the confined atomic cloud. We monitor the transition from a “soft” to a “hard” effective potential by studying the backaction of the trapped (m = 0) atoms onto the condensate which provides their confinement. The controlled outcoupling of the trapped atoms by shaping the condensate wave function is explored. We observe a pulsed emission of atoms from the trapping region reminiscent of an atom laser.

03.75.Mn - Multicomponent condensates; spinor condensates.
67.85.-d - Ultracold gases, trapped gases.

© EPLA 2008