Generic and significant regularities are shown to occur in the quasienergy spectra of the generalized
quantum kicked particle for arbitrary quasimomentum, a quantity most relevant in atom-optics
experimental realizations of this paradigmatic nonintegrable system. The spectral regularities are
basically different from the usual ones associated with ordered regions in a mixed phase space,
since they are completely independent of the chaos strength. Their origin are free-motion features
unaffected by the nonintegrability. The generic regularities are dense subspectra, each being
either a regular level sequence with approximately a Poisson level-spacing distribution or a ladder
of equally-spaced levels. The quantum dynamics associated with each regular subspectrum is
essentially free for arbitrarily strong chaos.

Original language | English |
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Number of pages | 5 |
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State | Published - 31 May 2012 |
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