The Electron-Glass in samples approaching the Mesoscopic regime

Abstract

We study the dependence of the glassy properties of strongly localized indium-oxide films on the sample lateral dimensions. Characteristic mesoscopic effects such as reproducible conductance fluctuations (CF) are readily observable in gated structures for sample size smaller than 100 microns measured at 4K, and the relative amplitude of the CF decreases with the sample volume as does the flicker noise. By contrast, down to sample size of few microns, the non-equilibrium features that are attributed to the electron-glass are indistinguishable from those observed in macroscopic samples, and in particular, the relaxation dynamics is independent of sample size down to 2 microns. In addition, The usual features that characterize the electron-glass including slow-relaxation, memory effects, and full-aging behavior are all observed in the `mesoscopic' regime, and they appear to be independent of the conductance fluctuations.

10 figures

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• Slow Conductance Relaxation in Insulating Granular Al: Evidence for Screening Effects
• Temperature memory and resistive glassy behaviors of a perovskite manganite
• Memory vs. irreversibility in thermal densification of amorphous glasses
• Slow relaxation of conductance of amorphous hopping insulators
• Optical excitation of Electron-Glasses
• Dielectric quantification of conductivity limitations due to nanofiller size in conductive powders and nanocomposites
• Electrical glassy behavior in granular aluminium thin films
• Relaxation dynamics of the three-dimensional Coulomb Glass model
• Charging of highly resistive granular metal films
• The effect of screening on the relaxation dynamics in the Coulomb glass
• Anomalous field effect and glassy behaviour in granular aluminium thin films: electron glass?