  Suspended single-walled carbon nanotube devices comprised of high quality
electrical contacts and two electrostatic gates per device are obtained.
Compared to nanotubes pinned on substrates, the suspended devices exhibit
little hysteresis related to environmental factors and manifest as cleaner
Fabry-Perot interferometers or single electron transistors. The high-field
saturation currents in suspended nanotubes related to optical phonon or zone
boundary phonon scattering are significantly lower due to the lack of efficient
heat sinking. The multiple gate design may also facilitate future investigation
of electromechanical properties of nanotube quantum systems.
