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Updated: Aug 11, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Microscopic dynamics in a strongly interacting Bose-Einstein condensate
N R Claussen1, E A Donley, S T Thompson
1JILA, National Institute of Standards and Technology and the University of Colorado, and and the Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA.
Abstract:
An initially stable 85Rb Bose-Einstein condensate (BEC) was subjected to a carefully controlled magnetic field pulse near a Feshbach resonance. This pulse probed the strongly interacting regime for the BEC, with the diluteness parameter (na(3)) ranging from 0.01 to 0.5. Condensate number loss resulted from the pulse, and for triangular pulses shorter than 1 ms, decreasing the pulse length actually increased the loss, until very short time scales (approximately 10 micros) were reached. The observed time dependence is very different from that expected in traditional inelastic loss processes, suggesting the presence of new microscopic BEC physics.
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