Low-frequency current noise and resistance fluctuations in multiwalled carbon nanotubes

Autor:	M. Paalanen, Leif Roschier, Reeta Tarkiainen, M. Ahlskog, Pertti Hakonen
Rok vydání:	2005
Předmět:	Noise power Materials science Condensed matter physics Noise spectral density Nanotechnology Low frequency Condensed Matter Physics Atomic and Molecular Physics and Optics Spectral line Electronic Optical and Magnetic Materials Orders of magnitude (time) Flicker noise Current (fluid) Noise (radio)
Zdroj:	Physica E: Low-dimensional Systems and Nanostructures. 28:57-65
ISSN:	1386-9477
DOI:	10.1016/j.physe.2005.01.014
Popis:	We have measured low-frequency current noise of arc-discharge-grown multiwalled carbon nanotube samples. At room temperature, the noise spectrum displays a regular const / f β dependence with β ∼ 1 and a noise current close to 10 pA / Hz at 100 nA and 100 Hz. The noise power decreases by 1–2 orders of magnitude when cooling down to 4.2 K. Due to the two-probe measurement, contacts are a likely source of the noise. At 4.2 K and below, we observe noise spectra consisting of a few Lorentzian line shapes, each of which arises due to fluctuations between two current values. The switching rates depend on the bias and they are asymmetric with respect to the direction of the current.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::94f1e1dfd37592b16eed785dd47a1e1f https://doi.org/10.1016/j.physe.2005.01.014 Zobrazit plný text záznamu Full Text from ScienceDirect