1/f noise in a Coulomb glass and in a noninteracting electron glass

Kirill Shtengel; Clare C Yu

doi:10.1117/12.500342

9 May 2003 1/f noise in a Coulomb glass and in a noninteracting electron glass

Kirill Shtengel, Clare C Yu

Proceedings Volume 5112, Noise as a Tool for Studying Materials; (2003) https://doi.org/10.1117/12.500342
Event: SPIE's First International Symposium on Fluctuations and Noise, 2003, Santa Fe, New Mexico, United States

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^-α 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.

Citation Download Citation

Kirill Shtengel and Clare C Yu "1/f noise in a Coulomb glass and in a noninteracting electron glass", Proc. SPIE 5112, Noise as a Tool for Studying Materials, (9 May 2003); https://doi.org/10.1117/12.500342

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