Bose-Einstein Condensation and Quantum Chaos Laboratory
Oklahoma State University
 


 

Quantum accelerator modes in a BEC

This first figure shows a series of time of flight images taken after a BEC was exposed to different numbers of kicks from a standing light wave. Note that you can see the individual momentum orders up to quite high kick numbers. The accelerator mode is the group of diffraction orders moving off almost linearly with pulse number towards the lower right. The reason the accelerator mode momentum increase does not appear linear with pulse number is an artifact of the way the momentum distribution was observed. This data was obtained when the time between pulses was 61 us. In the third figure on this page we show what happens when this time is the Talbot time.

The second figure plots a series of pictures of the BEC after it has been diffracted by 10 standing wave pulses. The series reflects changes in the time between pulses. The time between pulses for the central frame was the Talbot time. Weak accelerator modes can be seen curving away from the central diffraction order in the upper left and lower right of the figure.

 

The figure again shows a series of time of flight images taken after a BEC was exposed to different numbers of kicks from a standing light wave, however in this case the time between pulses was the Talbot time. Note that there is no accelerator mode here.

 

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