Quantum fluctuations and collective oscillations of a Bose-Einstein condensate in a 2D optical lattice
Anno: 2006
Autori: Orso G., Menotti C., Stringari S.
Affiliazione autori: BEC-INFM and Dipartimento di Fisica, Universita’ di Trento, 1-38050 Povo, Italy;
ICFO Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain
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.
Giornale/Rivista: PHYSICAL REVIEW LETTERS
Volume: 97 (19) Da Pagina: 190408-1 A: 190408-4
Parole chiavi: Bose-Einstein condensate; optical lattices; quantum fluctuationsDOI: 10.1103/PhysRevLett.97.190408Citazioni: 13dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-28Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui