Dynamics of Matter-Wave Solitons in a Ratchet Potential
D. Poletti, T. J. Alexander, E. A. Ostrovskaya, B. W. Li, and Yu. S. Kivshar,
Phys. Rev. Lett. 101, 150403-4 (2008).
[Full-text PDF (686 Kb)]
Abstract: We study the dynamics of bright solitons formed in a Bose-Einstein condensate with attractive atomic interactions perturbed by a weak bichromatic optical lattice potential. The lattice depth is a biperiodic function of time with a zero mean, which realizes a flashing ratchet for matter-wave solitons. We find that the average velocity of a soliton and the soliton current induced by the ratchet depend on the number of atoms in the soliton. As a consequence, soliton transport can be induced through scattering of different solitons. In the regime when matter-wave solitons are narrow compared to the lattice period the dynamics is well described by the effective Hamiltonian theory.
Keywords: brownian motors
Copyright © by the respective publisher.
This article may be downloaded for personal use only.
Any other use requires prior permission of the author
and the publisher.