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Measuring carbon nanotube vibrations using a single-electron transistor as a fast linear amplifier
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Measuring carbon nanotube vibrations using a single-electron transistor as a fast linear amplifier
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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 in real time. The sensitivity of this continuous displacement measurement approaches within a factor 470 of the standard quantum limit.
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