Anharmonic parametric excitation in optical lattices

Details Anharmonic parametric excitation in optical lattices Anharmonic parametric excitation in optical lattices

2001-03-16

arxiv.org/abs/physics/0103046v1

Phys. Rev. A 64, 033403 (2001)

Physics

Atomic Physics

7 pages, 5 figures

Scientific paper

10.1103/PhysRevA.64.033403

We study both experimentally and theoretically the losses induced by parametric excitation in far-off-resonance optical lattices. The atoms confined in a 1D sinusoidal lattice present an excitation spectrum and dynamics substantially different from those expected for a harmonic potential. We develop a model based on the actual atomic Hamiltonian in the lattice and we introduce semiempirically a broadening of the width of lattice energy bands which can physically arise from inhomogeneities and fluctuations of the lattice, and also from atomic collisions. The position and strength of the parametric resonances and the evolution of the number of trapped atoms are satisfactorily described by our model.

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