Characterisation of a three-dimensional Brownian motor in optical latticesP. Sjölund, S. J.H. Petra, C. M. Dion, H. Hagman, S. Jonsell and A. KastbergEur. Phys. J. D, 44 2 (2007) 381-388DOI: https://doi.org/10.1140/epjd/e2007-00233-3