Stationary and non-stationary fluid flow of a Bose-Einstein condensate through a penetrable barrier

Details Stationary and non-stationary fluid flow of a Bose-Einstein condensate through a penetrable barrier Stationary and non-stationary fluid flow of a Bose-Einstein condensate through a penetrable barrier

2007-04-18

arxiv.org/abs/0704.2427v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.160405

We experimentally study the fluid flow induced by a broad, penetrable barrier moving through an elongated dilute gaseous Bose-Einstein condensate. The barrier is created by a laser beam swept through the condensate, and the resulting dipole potential can be either attractive or repulsive. We examine both cases and find regimes of stable and unstable fluid flow: At slow speeds of the barrier, the fluid flow is stationary due to the superfluidity of the condensate. At intermediate speeds, we observe a non-stationary regime in which the condensate gets filled with dark solitons. At faster speeds, soliton formation completely ceases and a remarkable absence of excitation in the condensate is seen again.

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