Synchronization in non dissipative optical lattices

Daniel Hennequin (1) , Philippe Verkerk (1)

1 PhLAM - Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523

The dynamics of cold atoms in conservative optical lattices obviously depends on the geometry of the lattice. But very similar lattices may lead to deeply different dynamics. For example, in a 2D optical lattice with a square mesh, the sign of the detuning plays a crucial role: in the blue detuned case, trajectories of an atom inside a well are chaotic for high enough energies. On the contrary, in the red detuned case, chaos is completely inhibited inside the wells. Here, we study in details the dynamical regimes of atoms inside a well of a red detuned lattice, with the aim to understand the dynamical mechanisms leading to the disappearance of chaos. We show that the motions in the two directions of space are frequency locked in most of the phase space, for most of the parameters of the lattice and atoms. This synchronization, not as strict as that of a dissipative system, is nevertheless a mechanism powerful enough to explain that chaos cannot appear in red detuned lattices.

Mots clés: cold atoms; optical lattices; chaos

Domaines: Physique Atomique [physics.atom-ph]; Dynamique Chaotique [nlin.CD]

Daniel Hennequin, Philippe Verkerk. Synchronization in non dissipative optical lattices. The European Physical Journal D : Atomic, molecular, optical and plasma physics, 2010, 57, pp.95-104. ⟨10.1140/epjd/e2009-00324-1⟩. ⟨hal-00395032v2⟩