Two-dimensional rocking ratchet for cold atoms

Details Two-dimensional rocking ratchet for cold atoms Two-dimensional rocking ratchet for cold atoms

2011-11-28

arxiv.org/abs/1111.6520v1

Phys. Rev. A 80, 023422 (2009)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevA.80.023422

We investigate experimentally a two-dimensional rocking ratchet for cold atoms, realized by using a driven three-beam dissipative optical lattice. AC forces are applied in perpendicular directions by phase-modulating two of the lattice beams. As predicted by the general theory [S. Denisov et al., Phys. Rev. Lett. 100, 224102 (2008)], we observe a rectification phenomenon unique to high-dimensional rocking ratchets, as determined by two single-harmonic drivings applied in orthogonal directions. Also, by applying two bi-harmonic forces in perpendicular directions, we demonstrate the possibility of generating a current in an arbitrary direction within the optical lattice plane.

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