Superfluid and Dissipative Dynamics of a Bose-Einstein Condensate in a Periodic Optical Potential

Details Superfluid and Dissipative Dynamics of a Bose-Einstein Condensate in a Periodic Optical Potential Superfluid and Dissipative Dynamics of a Bose-Einstein Condensate in a Periodic Optical Potential

2001-02-05

arxiv.org/abs/cond-mat/0102076v1

Phys. Rev. Lett. 86, 4447 (2001).

Physics

Condensed Matter

4 pages, including figures

Scientific paper

10.1103/PhysRevLett.86.4447

We create Bose-Einstein condensates of 87-rubidium in a static magnetic trap with a superimposed blue-detuned 1D optical lattice. By displacing the magnetic trap center we are able to control the condensate evolution. We observe a change in the frequency of the center-of-mass oscillation in the harmonic trapping potential, in analogy with an increase in effective mass. For fluid velocities greater than a local speed of sound, we observe the onset of dissipative processes up to full removal of the superfluid component. A parallel simulation study visualizes the dynamics of the BEC and accounts for the main features of the observed behavior.

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