Quantum Ratchets

@article{Grifoni1999QuantumR,
  title={Quantum Ratchets},
  author={M. Grifoni},
  journal={Science},
  year={1999},
  volume={286},
  pages={2229 - 2229}
}
We investigate quantum Brownian motion in adiabatically rocked ratchet systems. Above a cross temperatureTc tunneling events are rare, yet they already substantially enhance the classical par current. BelowTc, quantum tunneling prevails and the classical predictions grossly underestimate transport. Upon approaching T ­ 0 the quantum current exhibits a tunneling induced reversal, an tends to a finite limit. [S0031-9007(97)03540-0] 
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