1/f Noise from Glauber Dynamics: Self-Consistent Interaction and Temperature Dependent Correlations. (15th January 2015)

• Record Type: Journal Article
• Authors: De, Amrit
• Other Names: Sergeenkov Sergei Academic Editor.
• Is Part Of: Advances in condensed matter physics. Volume 2015(2015)
• Publication Date: 2015-01-15
• Subjects: Condensed matter -- Periodicals; Condensed matter; Periodicals; 530.41
• DOI: 10.1155/2015/607021
• Languages: English
• ISSNs: 1687-8124

Abstract

Abstract : 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 n th-order correlation functions forN arbitrary interacting two-level systems (TLSs). This model is fully consistent with existing methods to calculate1 / 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 that1 / f α 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.