Phase-control of directed diffusion in a symmetric optical lattice

Details Phase-control of directed diffusion in a symmetric optical lattice Phase-control of directed diffusion in a symmetric optical lattice

2003-09-29

arxiv.org/abs/quant-ph/0309208v1

Phys. Rev. Lett. 90 (2003) 094101

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.90.094101

We demonstrate the phenomenon of directed diffusion in a symmetric periodic potential. This has been realized with cold atoms in a one-dimensional dissipative optical lattice. The stochastic process of optical pumping leads to a diffusive dynamics of the atoms through the periodic structure, while a zero-mean force which breaks the temporal symmetry of the system is applied by phase-modulating one of the lattice beams. The atoms are set into directed motion as a result of the breaking of the temporal symmetry of the system.

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