E.1
Log Number: 24
Abstract Submitted to the NT-99-Logo NANOTUBE-99 Workshop:

Detecting standing-wave bending modes on carbon nanotubes through electronic transport

M. Kociak1, A. Yu. Kasumov1,2, R. Deblock1, B. Reulet1, H. Bouchiat1, I. I. Khodos2, Yu. B. Gorbatov2, V. T. Volkov 2 and C.Journet3

1Laboratoire de Physique des Solides, Associé au CNRS, Bât 510, Université Paris-Sud, 91405, Orsay, France
2Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences, Chernogolovka 142432 Moscow Region, Russia
3 Groupe de Dynamique des Phases Condensées, Université Montpellier II, 34095 Montpellier, France

Contact e-mail: bouchiat@lps.u-psud.fr, kociak@lps.u-psud.fr

By measuring the dc resistance of 1mm long ropes of single walled-carbon nanotubes suspended between 2 metallic contacts, we show that it is possible to excite mechanical bending modes on these samples with a radio-frequency electric field. This field is produced by an antenna located in the vicinity of the sample. We attribute the mechanism of conversion of electromagnetic waves into mechanical ones to the presence of uncompensated charges on the tube. For certain particular values of frequencies we observe a huge increase or decrease of the sample resistance. These resonances correspond to the eigen frequencies for transverse mechanical vibrations of the rope. The observed peaks are proportional, both in sign and amplitude, to the temperature derivative of the resistance. They are related to the heating of the rope at the mechanical resonances. From the analysis of this phenomenon we can estimate the heat capacitance and the electron-phonon scattering time in the rope.


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