Phys. Rev. Lett. 86, 4447–4450 (2001)Superfluid and Dissipative Dynamics of a Bose-Einstein Condensate in a Periodic Optical PotentialReceived 2 February 2001; published in the issue dated 14 May 2001 We create Bose-Einstein condensates of 87Rb 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 Bose-Einstein condensate and accounts for the main features of the observed behavior. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4447
DOI:
10.1103/PhysRevLett.86.4447
PACS:
03.75.Fi, 32.80.Pj, 67.57.De
See AlsoComment: Biao Wu and Qian Niu, Dynamical or Landau Instability?, Phys. Rev. Lett. 89, 088901 (2002). Reply: S. Burger, F. S. Cataliotti, C. Fort, F. Minardi, M. Inguscio, M. L. Chiofalo, and M. P. Tosi, Burger et al. Reply:, Phys. Rev. Lett. 89, 088902 (2002). |
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