  Suspended carbon nanotubes are known to support self-driven oscillations due
to electromechanical feedback under certain conditions, including low
temperatures and high mechanical quality factors. Prior reports identified
signatures of such oscillations in Kondo or high-bias transport regimes. Here,
we observe self-driven oscillations that give rise to significant conduction in
normally Coulomb-blockaded low-bias transport. Using a master equation model,
the self-driving is shown to result from strongly energy-dependent electron
tunneling, and the dependencies of transport features on bias, gate voltage,
and temperature are well reproduced.
