We demonstrate sensitive and fast electrical measurements of a carbon nanotube mechanical resonator. The nanotube is configured as a single-electron transistor, whose conductance is a sensitive transducer for its own displacement. Using an impedance-matching circuit followed by a cryogenic amplifier, the vibrations can be monitored at radio frequency. The sensitivity of this continuous displacement measurement approaches within a factor 470 of the standard quantum limit.
Measuring carbon nanotube vibrations using a single-electron transistor as a fast linear amplifier
Yutian Wen, N. Ares, T. Pei, G. A. D. Briggs, E. A. Laird; Measuring carbon nanotube vibrations using a single-electron transistor as a fast linear amplifier. Appl. Phys. Lett. 8 October 2018; 113 (15): 153101. https://doi.org/10.1063/1.5052185
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