D. R. Schmid, P. L. Stiller, Ch. Strunk, A. K. Huettel
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 tracing the resonance quality factor of the system as rf-driven nano-electromechanical resonator in an increasing magnetic field.
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http://arxiv.org/abs/1203.2319
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