Characterisation of a three-dimensional Brownian motor in optical lattices |
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Authors: | P Sjölund S JH Petra C M Dion H Hagman S Jonsell A Kastberg |
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Institution: | 1.Department of Physics,Ume? University,Ume?,Sweden |
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Abstract: | We present here a detailed study of the behaviour of a three dimensional Brownian motor based on cold atoms in a double optical
lattice P. Sj?lund et al., Phys. Rev. Lett. 96, 190602 (2006)]. This includes both experiments and numerical simulations of a Brownian particle. The potentials used are
spatially and temporally symmetric, but combined spatiotemporal symmetry is broken by phase shifts and asymmetric transfer
rates between potentials. The diffusion of atoms in the optical lattices is rectified and controlled both in direction and
speed along three dimensions. We explore a large range of experimental parameters, where irradiances and detunings of the
optical lattice lights are varied within the dissipative regime. Induced drift velocities in the order of one atomic recoil
velocity have been achieved. |
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Keywords: | 32 80 Lg Mechanical effects of light on atoms molecules and ions 05 40 Jc Brownian motion 32 80 Pj Optical cooling of atoms trapping |
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