Abstract
The stable periodic orbits of an area-preserving map on the 2-torus, which is formally a variant of the standard map, have been shown to explain the quantum accelerator modes that were discovered in experiments with laser-cooled atoms. We show that their parametric dependence exhibits Arnol'd-like tongues and perform a perturbative analysis of such structures. We thus explain the arithmetical organization of the accelerator modes and discuss experimental implications thereof.
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