Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 72: Nanomechanics (jointly with BP, DF, and DY)
TT 72.4: Talk
Friday, March 15, 2013, 11:30–11:45, H20
Carbon nanotube nano-electromechanical resonators — driving, damping, detection — Daniel Schmid, Peter Stiller, Sabine Kugler, Alois Dirnaichner, Christoph Strunk, and •Andreas K. Hüttel — Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany
Single wall carbon nanotubes are not only excellent electrical conductors or semiconductors. Additionally, the carbon lattice causes large mechanical stability, with a Young’s modulus significantly exceeding that of stainless steel. Recent research has shown the mechanical quality factor of a suspended carbon nanotube nano-electromechanical resonator to rise above 105 at cryogenic temperatures. At these high values, mechanical motion can be 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. As a perspective, future experiments may show a carbon nanotube as a system coherent in both electronic and mechanical aspects.