Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 98: Transport: Nanomechanics
TT 98.8: Vortrag
Donnerstag, 3. April 2014, 17:15–17:30, BEY 81
Coupled Graphene Mechanical Resonators — •Ioannis Tsioutsios1,2, Joel Moser1,2, José Antonio Plaza3, and Adrian Bachtold1,2 — 1ICFO, Av. Carl Friedrich Gauss, 08860 Castelldefels, Barcelona, Spain — 2ICN, CIN2-CSIC, Campus UAB, 08193 Barcelona, Spain — 3IMB-CNM (CSIC), E-08193 Bellaterra, Barcelona, Spain
Coupled mechanical resonators show reach variety of non-linear dynamics such as synchronization and chaos. Moreover, they offer new strategies to improve the quality factor and detect charge and mass with high sensitivity. Such devices have been mainly fabricated form metallic and silicon-based materials using top-down micromachining.
Single mechanical resonators based on alternative materials like carbon nanotubes and graphene sheets have been demonstrated and show a wide variety of useful properties like very high resonant frequency, extremely high mass and force sensitivity, and strong mechanical nonlinearities. However, so far it has not been possible to use them as building blocks to create coupled resonator devices.
In this work, we demonstrate a multi-element resonant structure consisting of two graphene sheets linked by a carbon nanotube beam. The mechanical vibrations are actuated and detected electrically using the mixing technique. Two mechanical eigenmodes are measured, each corresponding to vibrations localized in a different graphene sheet. Coupling between the eigenmodes is observed and is evaluated by measuring the shift of the resonance frequency of one graphene sheet as a function of the vibration amplitude of the other.