Aluminum Single Electron Transistors with Islands Isolated from a Substrate

Details Aluminum Single Electron Transistors with Islands Isolated from a Substrate Aluminum Single Electron Transistors with Islands Isolated from a Substrate

1999-12-10

arxiv.org/abs/cond-mat/9912179v1

Journal of Low Temperature Physics, Vol. 118, Nos. 5/6, 2000, pp.287

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Review paper, latex, 10 pages, 7 figures, to be publ. in JLTP, 2000; Proceeding of "Electron Transport in Mesoscopic Systems",

Scientific paper

The low-frequency noise figures of single-electron transistors (electrometers) of traditional planar and new stacked geometry were compared. We observed a correlation between the charge noise and the contact area of the transistor island with a dielectric substrate in the set of Al transistors located on the same chip and having almost similar electric parameters. We have found that the smaller the contact area the lower the noise level of the transistor. The lowest noise value 8*10E-6 e/sqrt(Hz) at f = 10 Hz. has been measured in a stacked transistor with an island which was completely isolated from a substrate. Our measurements have unambiguously indicated that the dominant source of the background charge fluctuations is associated with a dielectric substrate

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