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In the top portion of this illustration, the gas of fermions (red) is trapped in an infrared laser beam (pink) and held in place by a magnetic field generated by current-carrying coils (blue). Two additional laser beams, shown in green, were used like coffee stirrers to set the gas into rotation. The result, as illustrated below, could be seen in a shadow picture of the expanded cloud that showed its superfluid behavior: The gas was pierced by a regular array of vortices. Image / Andre Schirotzek, MIT |
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