A three-dimensional Brownian motor, realised with symmetric optical lattices
2009 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951, Vol. 246, no 5, 999-1005 p.Article in journal (Refereed) Published
A three-dimensional Brownian motor is realised using lasercooled caesium atoms trapped in a system of two static, and individually symmetric, optical lattices; a so-called double optical lattice. Isotropic fluctuations, emanating from light scattering, are rectified, and the diffusion of the ensemble of atoms is biased, with a resulting constant velocity that is controllable both in direction and magnitude. The working principle of the Brownian motor can be seen as a pulsation between two different potentials, both symmetric but around different points. The correlation between interferometric spatial offsets, and imbalance in optical pumping rates, leads to a spatio-temporal asymmetry sufficient for generating a controlled, directed motion.
Place, publisher, year, edition, pages
2009. Vol. 246, no 5, 999-1005 p.
Atom and Molecular Physics and Optics
Research subject Physics
IdentifiersURN: urn:nbn:se:umu:diva-30839DOI: 10.1002/pssb.200881559OAI: oai:DiVA.org:umu-30839DiVA: diva2:287624