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The classical walking behaviors of a single atom in an amplitude-modulatedstanding wave lattice beyond the internal dynamics are investigated. Based on asimple effective model, we identify a diversity of dynamic regimes of atomicmotion by periodically adjusting the lattice depth. Harmonic oscillation orpendulum rotation with classical step-jumping, random scattering walking,chaotic transportation, quasi-periodic trapped motion and roughly ballisticfree flying are found in this simple model within different parametric regionsby approximate analyses. Our study demonstrates a complex motion of single atomin modulating optical lattice beyond the quantum description.

Diverse classical walking of a single atom in an amplitude-modulated standing wave lattice