Synchronization of Hamiltonian motion and dissipative effects in optical lattices: Evidence for a stochastic resonance

摘要

We theoretically study the influence of the noise strength on the excitationof the Brillouin propagation modes in a dissipative optical lattice. We showthat the excitation has a resonant behavior for a specific amount of noisecorresponding to the precise synchronization of the Hamiltonian motion on theoptical potential surfaces and the dissipative effects associated with opticalpumping in the lattice. This corresponds to the phenomenon of stochasticresonance. Our results are obtained by numerical simulations and correspond tothe analysis of microscopic quantities (atomic spatial distributions) as wellas macroscopic quantities (enhancement of spatial diffusion and pump-probespectra). We also present a simple analytical model in excellent agreement withthe simulations.