VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013

 QNplage

 Nanophysics: from fundamentals to applications

(the return)

 

Wednesday 7
Nems, molecules

› 14:20 - 14:40 (20min)
Carbon nanotube nano-electromechanical resonators - driving, damping, detection
Daniel Schmid  1@  , Peter Stiller  1@  , Sabine Kugler  1@  , Christoph Strunk  1@  , Andreas Hüttel  1, *@  
1 : Universität Regensburg  -  Website
Institute for Experimental and Applied Physics University of Regensburg 93040 Regensburg -  Germany
* : Corresponding author

Recent research has shown that the mechanical quality factor of a carbon nanotube nano-electromechanical resonator can rise above 10^5 at cryogenic temperatures. At these high values, mechanical motion is excited by minute driving forces. At the same time, the electronically nonlinear behaviour of the quantum dot forming inside the carbon nanotube enables detection of the mechanical motion.

With this, we present a rich system where single-electron tunneling directly couples to and influences mechanical motion. A dc current alone is sufficient to excite vibration via feedback effects. In turn, the mechanical vibrations can be suppressed with a magnetic field by means of eddy current dissipation. The quantum dot provides a clean quantum-mechanical few-carrier system, and mechanical effects can be used to perform time-averaged charge measurements. As a perspective, future experiments may show a carbon nanotube as a system coherent in both electronic and mechanical aspects.


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