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Electromechanical instabilities of suspended carbon nanotubes-multi mode excitations

L. Magnus Jonsson (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Leonid Y. Gorelik (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Robert I. Shekhter ; Mats Jonson
New Journal of Physics (1367-2630). Vol. 9 (2007), p. 90.
[Artikel, refereegranskad vetenskaplig]

We investigate theoretically the occurrence of ‘shuttle-like’ electromechanical instabilities in systems where charge transfer processes interact with several mechanical degrees of freedom simultaneously. In particular we consider the excitation of the multiple bending modes of a suspended carbon nanotube (CNT) due to the injection of current from the tip of a scanning tunnelling microscope (STM) into the suspended part of the tube. With respect to the shuttle instability, we show that the different bending modes can be treated independently in the limit of weak electromechanical coupling. As a result one or more modes—depending on the strength of the tunnel coupling between the CNT and the STM-tip—can be unstable.We find that it is possible to selectively excite a specific mode by tuning the distance between the STM-tip and the CNT. Furthermore, we have investigated the stable (limit cycle) regime that develops as a result of the shuttle instability when only one bending mode is unstable.

Nyckelord: Electromechanical instabilities, suspended carbon nanotubes, multi-mode excitations



Denna post skapades 2007-05-08. Senast ändrad 2008-06-12.
CPL Pubid: 41387

 

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Institutioner (Chalmers)

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

Ämnesområden

Mesoskopisk fysik

Chalmers infrastruktur