We demonstrate the effect of single-electron tunneling (SET) through a carbonnanotube quantum dot on its nanomechanical motion. We find that the frequencyresponse and the dissipation of the nanoelectromechanical system (NEMS) to SETstrongly depends on the electronic environment of the quantum dot, inparticular on the total dot capacitance and the tunnel coupling to the metalcontacts. Our findings suggest that one could achieve quality factors of10$^{6}$ or higher by choosing appropriate gate dielectrics and/or by improvingthe tunnel coupling to the leads.
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