Next-generation ICT can now be developed using the nonlinear effects present in graphene membranes.
Pictorial view of the system: the #graphene membrane (white) oscillates at three different frequencies. By exciting the central frequency mode (green) it is possible to transfer energy from the fundamental mode (blue) to the highest frequency mode (red), hence effectively cooling the former. Conversely, driving the highest mode (red) will lead to a transfer of energy to the central and fundamental mode (green and blue respectively), resulting in the amplification of the latter. (Credits: Image courtesy of R. De Alba.)
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Similar to drums in usual drumsets, nanoscale graphene membranes have a unique set of oscillating modes that relate to particular oscillation frequencies. An external voltage can be applied to excite these oscillating modes.
Researchers have demonstrated that a circular graphene membrane can be played like a drumset if a suitable external force is applied. The research, undertaken by researchers from Cornell University and the University of Jyväskylä, has been reported in the Nature Nanotechnology journal. The work was funded by theAcademy of Finland.
The main idea of this research revolves around the fact that when the system is excited at a specific frequency (by playing a certain note) the behavior of the graphene membrane can be controlled at a different frequency. This in turn suppresses or increases the vibrations based on definite excitation conditions.
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