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We demonstrate theoretically and experimentally the phenomenon of vibrationalresonance in a periodic potential, using cold atoms in an optical lattice as amodel system. A high-frequency (HF) drive, with frequency much larger than anycharacteristic frequency of the system, is applied by phase-modulating one ofthe lattice beams. We show that the HF drive leads to the renormalization ofthe potential. We used transport measurements as a probe of the potentialrenormalization. The very same experiments also demonstrate that transport canbe controlled by the HF drive via potential renormalization.

Vibrational mechanics in an optical lattice: controlling transport via potential renormalization