Controllable 3D atomic Brownian motor in optical lattices |
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Authors: | C M Dion P Sjölund S JH Petra S Jonsell M Nylén L Sanchez-Palencia A Kastberg |
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Institution: | 1. Department of Physics, Ume? University, 90187, Ume?, Sweden 2. Laboratoire Charles Fabry de l'Institut d'Optique, CNRS, Univ. Paris-Sud, Campus Polytechnique, RD-128, 91127, Palaiseau Cedex, France
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Abstract: | We study a Brownian motor, based on cold atoms in optical lattices, where atomic motion can be induced in a controlled manner
in an arbitrary direction, by rectification of isotropic random fluctuations. In contrast with ratchet mechanisms, our Brownian
motor operates in a potential that is spatially and temporally symmetric, in apparent contradiction to the Curie principle.
Simulations, based on the Fokker-Planck equation, allow us to gain knowledge on the qualitative behaviour of our Brownian
motor. Studies of Brownian motors, and in particular ones with unique control properties, are of fundamental interest because
of the role they play in protein motors and their potential applications in nanotechnology. In particular, our system opens
the way to the study of quantum Brownian motors. |
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