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

Autor: Amrit De
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: Advances in Condensed Matter Physics, Vol 2015 (2015)
Druh dokumentu: article
ISSN: 1687-8108
1687-8124
DOI: 10.1155/2015/607021
Popis: 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 N arbitrary interacting two-level systems (TLSs). This model is fully consistent with existing methods to calculate 1/f 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 1/fα 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.
Databáze: Directory of Open Access Journals
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