Self-detecting gate-tunable nanotube paddle resonators

Witkamp, B.; Poot, M.; Pathangi, H.; Hüttel, A. K.; van der Zant, H. S. J.
September 2008
Applied Physics Letters;9/15/2008, Vol. 93 Issue 11, p111909
Academic Journal
We have fabricated suspended metal paddle resonators with carbon nanotubes functioning as self-detecting torsional springs. We observe gate-tunable resonances that either tune to higher or to lower frequencies when increasing the dc voltage on the back gate. We attribute the former modes to flexural vibrations of the paddle resonator, while the latter ones are identified as torsional vibrations. Compared to top-down silicon fabricated paddle resonators, nanotube springs have smaller torsional spring constants and provide a larger frequency tunability.


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