Tracking quasiclassical chaos in ultracold boson gases.
We study the dynamics of an ultracold boson gas in a lattice submitted to a constant force. We track the route of the system towards chaos created by the many-body-induced nonlinearity and show that relevant information can be extracted from an experimentally accessible quantity, the gas mean position. The threshold nonlinearity for the appearance of chaotic behavior is deduced from Kolmogorov-Arnold-Moser arguments and agrees with the value obtained by calculating the associated Lyapunov exponent.
Laboratoire de Physique des Lasers, Atomes et Molécules, Université des Sciences et Technologies de Lille, CNRS, F-59655 Villeneuve d'Ascq Cedex, France.
Maxence
M
Lepers
Véronique
V
Zehnlé
Jean Claude
JC
Garreau