Incoherence of Bose-Einstein condensates at supersonic speeds due to quantum noise

Details Incoherence of Bose-Einstein condensates at supersonic speeds due to quantum noise Incoherence of Bose-Einstein condensates at supersonic speeds due to quantum noise

2008-10-31

arxiv.org/abs/0810.5687v1

Physics

Condensed Matter

Other Condensed Matter

6 pages, 5 figures

Scientific paper

10.1103/PhysRevA.78.063614

We calculate the effect of quantum noise in supersonic transport of Bose-Einstein condensates. When an obstacle obstructs the flow of atoms, quantum fluctuations cause atoms to be scattered incoherently into random directions. This suppresses the propagation of Cherenkov radiation, creating quantum turbulence and a crescent of incoherent atoms around the obstacle. We observe similar dynamics if the BEC is stirred by a laser beam: crescents of incoherent atoms are emitted from the laser's turning-points. Finally, we investigate supersonic flow through a disordered potential, and find that the quantum fluctuations generate an accumulation of incoherent atoms as the condensate enters the disorder.

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