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Advances in Condensed Matter Physics
Volume 2015 (2015), Article ID 607021, 10 pages
Research Article

Noise from Glauber Dynamics: Self-Consistent Interaction and Temperature Dependent Correlations

Department of Physics and Astronomy, University of California, Riverside, CA 92521, USA

Received 10 December 2014; Accepted 18 December 2014

Academic Editor: Sergei Sergeenkov

Copyright © 2015 Amrit De. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Low frequency flicker noise has been argued to occur in spatially extended metastable systems near a critical point (Bak et al., 1987). An Ising-Glauber model based method is suggested here to systematically obtain temperature dependent nth-order correlation functions for arbitrary interacting two-level systems (TLSs). This model is fully consistent with existing methods to calculate noise spectra from TLSs and complements them. However, with as such no a priori assumptions on the typical log normal distribution of fluctuation rates, it is shown that noise manifests in two different cases: first in the thermodynamic limit on a 2D lattice with long range antiferromagnetic interactions at low temperatures and second in the case of a statistical ensemble of finite-sized spin clusters representing disorder, but where each cluster is ordered due to ferromagnetic interactions.