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Nonresonant high frequency excitation of mechanical vibrations in a graphene based nanoresonator

Axel Martin Eriksson (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Marina V. Voinova ; Leonid Y. Gorelik (Institutionen för teknisk fysik, Kondenserade materiens teori)
New Journal of Physics (1367-2630). Vol. 17 (2015),
[Artikel, refereegranskad vetenskaplig]

We theoretically analyze the dynamics of a suspended graphene membrane which is in tunnel contact with grounded metallic electrodes and subjected to ac-electrostatic potential induced by a gate electrode. It is shown that for such a system the retardation effects in the electronic subsystem generate an effective pumping for the relatively slow mechanical vibrations if the driving frequency exceeds the inverse charge relaxation time. Under this condition there is a critical value of the driving voltage amplitude above which the pumping overcomes the intrinsic damping of the mechanical resonator, leading to a mechanical instability. This nonresonant instability is saturated by nonlinear damping and the system exhibits self-sustained oscillations of relatively large amplitude.

Nyckelord: nanomechanics, graphene, self-sustained oscillation

Denna post skapades 2015-07-06. Senast ändrad 2015-07-09.
CPL Pubid: 219452


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)


Teknisk fysik

Chalmers infrastruktur