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TT: Fachverband Tiefe Temperaturen

TT 58: Poster Session Transport & Matter at Low Temperature

TT 58.24: Poster

Donnerstag, 14. März 2013, 15:00–19:00, Poster D

Negative frequency tuning of a carbon nanotube nanomechanical resonator — Sabine Kugler, Daniel Schmid, •Peter Stiller, Christoph Strunk, and Andreas K. Hüttel — Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany

The transversal mechanical resonance frequency of a suspended carbon nanotube doubly clamped at its contact points can be tuned with an externally applied gate voltage. In a simple picture, the electrostatic force between the gate and the resonator applies mechanical tension, increasing the resonance frequency at finite voltage. We present data on an unusual resonator where application of a back gate voltage leads to a strong detuning of the mechanical resonance towards lower frequencies; we observe a decrease of approximately 30%. Tentative models for this effect are discussed.