Directed transport of atoms in a Hamiltonian quantum ratchet.

@article{Salger2009DirectedTO,
  title={Directed transport of atoms in a Hamiltonian quantum ratchet.},
  author={Tobias Salger and Sebastian Kling and Tim Hecking and Carsten Geckeler and Luis Morales-Molina and Martin Weitz},
  journal={Science},
  year={2009},
  volume={326 5957},
  pages={1241-3}
}
Classical ratchet potentials, which alternate a driving potential with periodic random dissipative motion, can account for the operation of biological motors. We demonstrate the operation of a quantum ratchet, which differs from classical ratchets in that dissipative processes are absent within the observation time of the system (Hamiltonian regime). An atomic rubidium Bose-Einstein condensate is exposed to a sawtooth-like optical lattice potential, whose amplitude is periodically modulated in… CONTINUE READING
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