| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2004: ¥900,000 (Direct Cost: ¥900,000)
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| Research Abstract |
In the present study, 1/f resistance fluctuation of carbon nanotube was investigated experimentally, theoretically and also some simulations were performed. The carbon nanotubes were filled to glass capillar of 0.1mm diameter, this was used as a resistance, and the electric resistance fluctuation was measured. Here, three types of samples were prepared Single-wall simple cylinder type, multi-wall simple cylinder type and multi-wall cylinder type with a corn like cap. Temperature of the samples was changed between 300K to 100K. As the results, the resistance fluctuation of any types of carbon nano-tubes showed 1/f spectrum and their intensity decreased by the decreasing of the sample temperature, while the resistance value doubled. The decreasing of resistance fluctuations by the temperature change of the sample that adhered a cap was 1/4 and that open cylinder samples were about 1/100. A phonon mode interaction between axial mode and circumference mode happens frequently through the ca
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p structure in the sample that adhered a cap. It is thought that the existence of strong interaction is the reason why the intensity of 1/f resistance fluctuation did not decrease so much in the capped sample. Therefore, The generation of 1/f resistance fluctuation thought to be related to intermodal interaction of atomic vibration.
In the simulation, fluctuation of the electron scattering probability in one-dimensional atomic chain having plural degree of freedom was investigated. Owing to the plural degree of freedom, though the non-linear term was not employed in the equation of motion, phonon mode interaction was generated and scattering probability showed 1/f spectra. These contents were reported to 18th international conference on noise and fluctuations, 2005, pp.795-798.
In the theory, it was reported that the distribution function of phonon from nonequiriburium to equiriburium shows t^<1/2> type relaxation. t^<1/2> type relaxation causes 1/f fluctuation. This content was reported to Journal of the Physical Society of Japan, Vol.74 No. 10, 2005, pp.2708-2711. Less
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