Characterisation of a three-dimensional Brownian motor in optical lattices P. Sjölund, S. J.H. Petra, C. M. Dion, H. Hagman, S. Jonsell and A. Kastberg Eur. Phys. J. D, 44 2 (2007) 381-388 Published online: 13 July 2007 DOI: 10.1140/epjd/e2007-00233-3