Few-hundred GHz Carbon Nanotube NEMS

Abstract

We study 23 to 30 nm long suspended single-wall carbon nanotube quantum dots and observe both their stretching and bending vibrational modes. We use low-temperature DC electron transport to excite and measure the tubes' bending mode by making use of a positive feedback mechanism between their vibrations and the tunneling electrons. In these nano-electro-mechanical-systems (NEMS), we measure fundamental bending frequencies $f_{bend}\approx$ 75 - 280 GHz, and extract quality factors $Q\sim 10^6$. The NEMS' frequencies can be tuned by a factor of two with tension induced by mechanical breakjunctions actuated by an electrostatic force, or tension from bent suspended electrodes.

Published in Nano Letters, 7 pages, 4 figures

References in corpus (12)

• A tunable carbon nanotube electromechanical oscillator
• A Mechanical Mass Sensor with Yoctogram Resolution
• Franck-Condon blockade and giant Fano factors in transport through single molecules
• Strong coupling between single-electron tunneling and nano-mechanical motion
• Carbon nanotubes as ultra-high quality factor mechanical resonators
• Electrical generation and absorption of phonons in carbon nanotubes
• Franck-Condon blockade in suspended carbon nanotube quantum dots
• Tunneling in suspended carbon nanotubes assisted by longitudinal phonons
• Vibrational and electronic heating in nanoscale junctions
• Single-electron Tunneling with Strong Mechanical Feedback
• Strong feedback and current noise in nanoelectromechanical systems
• Phonon-phonon interactions and phonon damping in carbon nanotubes