Quantum fluctuations and collective oscillations of a Bose-Einstein condensate in a 2D optical lattice (Articolo in rivista)

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Label
  • Quantum fluctuations and collective oscillations of a Bose-Einstein condensate in a 2D optical lattice (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Orso, G; Menotti, C; Stringari, S (2006)
    Quantum fluctuations and collective oscillations of a Bose-Einstein condensate in a 2D optical lattice
    in Physical review letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Orso, G; Menotti, C; Stringari, S (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 97 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Trent, BEC, INFM, I-38050 Trento, Italy; Univ Trent, Dipartimento Fis, I-38050 Trento, Italy; ICFO Inst Ciencies Foton, Barcelona 08860, Spain (literal)
Titolo
  • Quantum fluctuations and collective oscillations of a Bose-Einstein condensate in a 2D optical lattice (literal)
Abstract
  • We use Bogoliubov theory to calculate the beyond mean field correction to the equation of state of a weakly interacting Bose gas in the presence of a tight 2D optical lattice. We show that the lattice induces a characteristic 3D to 1D crossover in the behavior of quantum fluctuations. Using the hydrodynamic theory of superfluids, we calculate the corresponding shift of the collective frequencies of a harmonically trapped gas. We find that this correction can be of the order of a few percent and hence easily measurable in current experiments. The behavior of the quantum depletion of the condensate is also discussed. (literal)
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