Nonlinear effects in periodic potentials: asymmetric Landau-Zener tunnelling of a Bose-Einstein condensate
Anno: 2004
Autori: Jona-Lasioni M., Morsch O., Cristiani M., Malossi N., Mueller J.H., Courtade E., Anderlini M., Arimondo E.
Affiliazione autori: Univ Pisa, INFM, Dipartimento Fis E Fermi, I-56127 Pisa, Italy
Abstract: From a two-level model for nonlinear Landau-Zener tunnelling between two energy bands of a Bose-Einstein condensate in a periodic potential we obtain unequal tunnelling rates for the two directions of tunnelling. With increasing nonlinearity, tunnelling from the ground state to the excited state is enhanced, whereas in the opposite direction it is suppressed. These findings are confirmed by numerical simulations of the condensate dynamics. Measuring the tunnelling rates for a condensate of rubidium atoms in an optical lattice, we have found experimental evidence for this asymmetry. We discuss the limitations of our approach and possible future experiments.
Giornale/Rivista: LASER PHYSICS LETTERS
Volume: 1 (3) Da Pagina: 147 A: 153
Parole chiavi: Bose-Einstein condensation; Landau-Zener tunneling; DOI: 10.1002/lapl.200310039Citazioni: 6dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-21Riferimenti 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