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Poot, M. (author), Etaki, S. (author), Yamaguchi, H. (author), Van der Zant, H.S.J. (author)We have employed a feedback cooling scheme, which combines high-frequency mixing with digital signal processing. The frequency and damping rate of a 2 MHz micromechanical resonator embedded in a dc SQUID are adjusted with the feedback, and active cooling to a temperature of 14.3 mK is demonstrated. This technique can be applied to GHz resonators...journal article 2011
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Poot, M. (author), Etaki, S. (author), Mahboob, I. (author), Onomitsu, K. (author), Yamaguchi, H. (author), Blanter, Y.M. (author), Van der Zant, H.S.J. (author)We have measured the backaction of a dc superconducting quantum interference device (SQUID) position detector on an integrated 1 MHz flexural resonator. The frequency and quality factor of the micromechanical resonator can be tuned with bias current and applied magnetic flux. The backaction is caused by the Lorentz force due to the change in...journal article 2010