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arxiv: 1203.2319 · v2 · pith:5ECJ6ZLFnew · submitted 2012-03-11 · ❄️ cond-mat.mes-hall

Magnetic damping of a carbon nanotube NEMS resonator

classification ❄️ cond-mat.mes-hall
keywords dampingmagneticcarbonfieldnano-electromechanicalnanotuberesonatorsingle
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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.

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