Three-junction SQUID rocking ratchet.

  title={Three-junction SQUID rocking ratchet.},
  author={Albert Sterck and Reinhold Kleiner and Dieter Koelle},
  journal={Physical review letters},
  volume={95 17},
We investigate three-junction SQUIDs which show voltage rectification if biased with an ac current drive with zero mean value. The Josephson phase across the SQUID experiences an effective ratchet potential, and the device acts as an efficient rocking ratchet, as demonstrated experimentally for adiabatic and nonadiabatic drive frequencies. For high-frequency drives the rectified voltage is quantized due to synchronization of the phase dynamics with the external drive. The experimental data are… 

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