Low velocity quantum reflection of Bose-Einstein condensates

Details Low velocity quantum reflection of Bose-Einstein condensates Low velocity quantum reflection of Bose-Einstein condensates

2006-03-17

arxiv.org/abs/cond-mat/0603463v1

Physics

Condensed Matter

Other Condensed Matter

4 figures

Scientific paper

10.1103/PhysRevLett.97.093201

We studied quantum reflection of Bose-Einstein condensates at normal incidence on a square array of silicon pillars. For incident velocities of 2.5-26 mm/s observations agreed with theoretical predictions that the Casimir-Polder potential of a reduced density surface would reflect slow atoms with much higher probability. At low velocities (0.5-2.5 mm/s), we observed that the reflection probability saturated around 60% rather than increasing towards unity. We present a simple model which explains this reduced reflectivity as resulting from the combined effects of the Casimir-Polder plus mean field potential and predicts the observed saturation. Furthermore, at low incident velocities, the reflected condensates show collective excitations.

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