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Proceedings Paper

Noise and hysteresis in charged stripe, checkerboard, and clump forming systems
Author(s): C. Reichhardt; C. J. Olson Reichhardt; A. R. Bishop
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Paper Abstract

We numerically examine noise fluctuations and hysteresis phenomena in charged systems that form stripe, labyrinth or clump patterns. It is believed that charge inhomogeneities of this type arise in two-dimensional (2D) quantum hall systems and in electron crystal structures in high temperature superconductors, while related patterns appear in manganites and type-I superconductors. Recent noise and transport experiments in two-dimensional electron gases and high temperature superconducting samples revealed both 1/fα noise signatures and hysteretic phenomena. Using numerical simulations we show that 1/fα noise fluctuations and hysteresis are generic features that occur in charge systems which undergo a type of phase separation that results in stripes, clumps, checkerboards, or other inhomogeneous patterns. We find that these systems exhibit 1/fα fluctuations with 1.2 < α < 1.8, rather than simple 1/f or 1/fα fluctuations. We also propose that the 2D metal insulator transition may be associated with a clump electron glass phase rather than a Wigner glass phase.

Paper Details

Date Published: 8 June 2007
PDF: 11 pages
Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 66001B (8 June 2007); doi: 10.1117/12.724614
Show Author Affiliations
C. Reichhardt, Los Alamos National Lab. (United States)
C. J. Olson Reichhardt, Los Alamos National Lab. (United States)
A. R. Bishop, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 6600:
Noise and Fluctuations in Circuits, Devices, and Materials
Massimo Macucci; Lode K.J. Vandamme; Carmine Ciofi; Michael B. Weissman, Editor(s)

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