Passive cooling of a micromechanical oscillator with a resonant electric circuit.

  title={Passive cooling of a micromechanical oscillator with a resonant electric circuit.},
  author={Kenneth R. Brown and Joseph W. Britton and Ryan J. Epstein and John Chiaverini and Dietrich Leibfried and David J. Wineland},
  journal={Physical review letters},
  volume={99 13},
We cool the fundamental mode of a miniature cantilever by capacitively coupling it to a driven rf resonant circuit. Cooling results from the rf capacitive force, which is phase shifted relative to the cantilever motion. We demonstrate the technique by cooling a 7 kHz cantilever from room temperature to 45 K, obtaining reasonable agreement with a model for the cooling, damping, and frequency shift. Extending the method to higher frequencies in a cryogenic system could enable ground state cooling… 

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