Noise near charge ordering transitions

Charles M Reichhardt

doi:10.1117/12.546861

25 May 2004 Noise near charge ordering transitions

Charles M Reichhardt

Proceedings Volume 5469, Fluctuations and Noise in Materials; (2004) https://doi.org/10.1117/12.546861
Event: Second International Symposium on Fluctuations and Noise, 2004, Maspalomas, Gran Canaria Island, Spain

Abstract

We analyze the noise fluctuations near charge ordering transitions in disordered materials. In particular we consider a two-dimensional (2D) system at finite temperature with a fixed number of defect sites and increase the number of mobile charges. We find that for a high density of charges the system forms a high mobility liquid with low spectral power and a white noise characteristic. As the density of charges is lowered we find a coexistence of liquid regions with locally frozen regions. In this regime the noise power is high and has a 1/f^α form with α ~ 0.5 to 1.5. For the low charge density regime we find a disordered frozen regime where all the charges are localized. We also find that for increasing temperature the noise power drops. We compare our results to recent noise experiments on the 2D metal-insulator transition and the vortex-liquid to vortex glass transition found in superconductors.

Citation Download Citation

Charles M Reichhardt "Noise near charge ordering transitions", Proc. SPIE 5469, Fluctuations and Noise in Materials, (25 May 2004); https://doi.org/10.1117/12.546861

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