Stochastic resonance in periodic potentials: realization in a dissipative optical lattice

Michele Schiavoni (1) , Francois-Regis Carminati (1) , Laurent Sanchez-Palencia (1) , Ferruccio Renzoni (1) , Gilbert Grynberg (1)

1 LKB (Lhomond) - Laboratoire Kastler Brossel

We have observed the phenomenon of stochastic resonance on the Brillouin propagation modes of a dissipative optical lattice. Such a mode has been excited by applying a moving potential modulation with phase velocity equal to the velocity of the mode. Its amplitude has been characterized by the center-of-mass (CM) velocity of the atomic cloud. At Brillouin resonance, we studied the CM-velocity as a function of the optical pumping rate at a given depth of the potential wells. We have observed a resonant dependence of the CM velocity on the optical pumping rate, corresponding to the noise strength. This corresponds to the experimental observation of stochastic resonance in a periodic potential in the low-damping regime.

Mots clés: Sisyphus; laser cooling; optical lattices; stochastic resonance; propagation modes

Domaines: Physique Quantique [quant-ph]

Michele Schiavoni, Francois-Regis Carminati, Laurent Sanchez-Palencia, Ferruccio Renzoni, Gilbert Grynberg. Stochastic resonance in periodic potentials: realization in a dissipative optical lattice. EPL - Europhysics Letters, 2002, 59, pp.493-499. ⟨hal-00000107⟩