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Proceedings Paper

1/f noise in a Coulomb glass and in a noninteracting electron glass
Author(s): Kirill Shtengel; Clare C Yu
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Paper Abstract

We show that 1/f noise is produced in a 3D electron glass by charge fluctuations due to electrons hopping between isolated sites and a percolating network at low temperatures. The low frequency noise spectrum goes as ω with α slightly larger than 1. This result together with the temperature dependence of \alpha and the noise amplitude are in good agreement with the recent experiments. These results hold true both for a noninteracting electron glass with a flat density of states and for a Coulomb glass. In the latter case, the density of states has a Coulomb gap that fills in with increasing temperature. For a large Coulomb gap width, this density of states gives a dc conductivity with a hopping exponent of ≈ 0.75 which has been observed in recent experiments. For a small Coulomb gap width, the hopping exponent ≈ 0.5. At low temperatures the noise amplitude of a noninteracting electron glass increases linearly with temperature while the noise amplitude of a Coulomb glass increases quadratically.

Paper Details

Date Published: 9 May 2003
PDF: 12 pages
Proc. SPIE 5112, Noise as a Tool for Studying Materials, (9 May 2003); doi: 10.1117/12.500342
Show Author Affiliations
Kirill Shtengel, Univ. of California/Irvine (United States)
Microsoft Corp. (United States)
Clare C Yu, Univ. of California/Irvine (United States)

Published in SPIE Proceedings Vol. 5112:
Noise as a Tool for Studying Materials
Michael B. Weissman; Nathan E. Israeloff; A. Shulim Kogan, Editor(s)

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