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Carbon nanotubes as ultrahigh quality factor mechanical resonators
Andreas K Hüttel1, Gary A Steele, Benoit Witkamp
1Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands.
Nano Letters
|June 5, 2009
Summary
Researchers observed carbon nanotube vibrations at extremely low temperatures using single-electron tunneling. This study reveals high-quality factor resonators with potential for nonlinear applications.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Suspended carbon nanotubes are promising mechanical resonators.
- Understanding their vibration modes at low temperatures is crucial for device applications.
- Previous studies have reported lower quality factors for nanotube resonators.
Purpose of the Study:
- To observe the transversal vibration mode of suspended carbon nanotubes at millikelvin temperatures.
- To investigate the resonance frequencies and quality factors of these nanotube resonators.
- To explore the nonlinear dynamics of nanotube resonators.
Main Methods:
- Utilizing single-electron tunneling current measurements to detect mechanical resonance.
- Actuating suspended nanotubes contact-free using radio frequency electric fields from a nearby antenna.
- Measuring resonance frequencies up to 350 MHz and quality factors exceeding 10^5.
Main Results:
- Observed sharp, gate-tunable resonances corresponding to the bending mode of the nanotube.
- Achieved significantly higher quality factors (Q > 10^5) compared to previous results.
- Demonstrated agreement between measured Q factor and intrinsic damping predictions.
- Showed that nanotube resonators can be easily driven into the nonlinear regime.
Conclusions:
- Suspended carbon nanotubes exhibit high-performance mechanical resonance at millikelvin temperatures.
- The observed high quality factors suggest low intrinsic damping in these systems.
- Carbon nanotube resonators are suitable for exploring nonlinear dynamics and potential applications.
