Düsseldorf 2007 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 52: Quantengase (Tunneln II)
Q 52.4: Talk
Thursday, March 22, 2007, 12:45–13:00, 6J
Many-body Landau-Zener tunnelling — Andrea Tomadin1, Riccardo Mannella1, and •Sandro Wimberger2 — 1Dipartimento di Fisica, Università degli Studi di Pisa, Largo Pontecorvo 3, I-56127 Pisa — 2Dipartimento di Fisica, Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino
A perturbative treatment of the Landau-Zener decay out of the ground-state band of a Bose-Hubbard model is presented. The decay channels are derived from a full two-band model in the presence of an additional linear Stark force. The dynamics of the ground-state band can be switched from a regular to a chaotic regime. The choice of the dynamical regime strongly influences the nature of the many-body Landau-Zener decay, which is mediated by the atom-atom interaction and the Stark force simultaneously.