Few-hundred GHz carbon nanotube nanoelectromechanical systems (NEMS).
basic_science · Level V
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- Record sourced from PubMed, PMID 22888989.
- Also identified by DOI 10.1021/nl3018065.
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Abstract
We study 23-30 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 nanoelectromechanical systems (NEMS), we measure fundamental bending frequencies f(bend) ≈ 75-280 GHz and extract quality factors Q ∼ 10(6). The NEMS's frequencies can be tuned by a factor of 2 with tension induced by mechanical breakjunctions actuated by an electrostatic force or tension from bent suspended electrodes.
Medical subject headings
- Crystallization
- Micro-Electrical-Mechanical Systems
- Microelectrodes
- Nanotechnology
- Nanotubes, Carbon