Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-09-03
Nano Letters, 10 (2), 461-465, 2010
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 4 figures
Scientific paper
10.1021/nl903133w
The recently found material graphene is a truly two-dimensional crystal and exhibits, in addition, an extreme mechanical strength. This in combination with the high electron mobility favours graphene for electromechanical investigations down to the quantum limit. Here, we show that a monolayer of graphene on SiO2 provides natural, ultra-small membranes of diameters down to 3 nm, which are caused by the intrinsic rippling of the material. Some of these nano-membranes can be switched hysteretically between two vertical positions using the electric field of the tip of a scanning tunnelling microscope (STM). They can also be forced to oscillatory motion by a low frequency ac-field. Using the mechanical constants determined previously, we estimate a high resonance frequency up to 0.4 THz. This might be favorable for quantum-electromechanics and is prospective for single atom mass spectrometers.
Echtermeyer T. J.
Geringer V.
Lemme Max C.
Liebmann Manfred
Mashoff T.
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