A suspended, doubly clamped single wall carbon nanotube is characterized at cryogenic temperatures. We observe specific switching effects in dc-current spectroscopy of the embedded quantum dot. These have been identified previously as nano-electromechanical self-excitation of the system, where positive feedback from single electron tunneling drives mechanical motion. A magnetic field suppresses this effect, by providing an additional damping mechanism. This is modeled by eddy current damping, and confirmed by measuring the resonance quality factor of the rf-driven nano-electromechanical resonator in an increasing magnetic field.
@article{arxiv.1203.2319,
title = {Magnetic damping of a carbon nanotube NEMS resonator},
author = {D. R. Schmid and P. L. Stiller and Ch. Strunk and A. K. Huettel},
journal= {arXiv preprint arXiv:1203.2319},
year = {2012}
}