Superfluid and dissipative dynamics of a Bose-Einstein condensate in a periodic optical potential

Year: 2001

Authors: Burger S., Cataliotti F. S., Fort C., Minardi F., Inguscio M., Chiofalo M., Tosi M. P.

Autors Affiliation: INFM-LENS, Dipartimento di Fisica, Università di Firenze, Largo Enrico Fermi 2, I-50125 Firenze, Italia;
INFM-Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italia

Abstract: We create Bose-Einstein condensates of Rb-87 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.


Volume: 86 (20)      Pages from: 4447  to: 4450

KeyWords: Computer simulation; Crystal lattices; Electron traps; Electronic density of states; Flow of fluids; Magnetic field effects; Oscillations; Phonons, Magnetic trap; Optical lattices; Periodic optical potential, Condensation
DOI: 10.1103/PhysRevLett.86.4447

Citations: 301
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