Temperature and field dependence of Dynamics in the Electron-Glass

Abstract

We describe several experimental methods to quantify dynamics in electron glasses and illustrate their use in the glassy phase of crystalline indium-oxide films. These methods are applied to study the dependence of dynamics on temperature and on non-ohmic electric fields at liquid helium temperatures. It is shown that over a certain range of temperature the dynamics becomes slower with temperature or upon increasing an applied non-ohmic field, a behavior suggestive of a quantum-glass. It is demonstrated that non-ohmic fields produce qualitatively similar results as raising the system temperature. Quantitatively however, their effect may differ marekdly. The experimental advantages of using fields to mimic higher temperature are pointed out and illustrated.

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• Ulta-slow relaxation in discontinuous-film based electron glasses
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• Aging Effects Across the Metal-Insulator Transition in Two Dimensions
• Intrinsic electron-glassiness in strongly-localized Be films
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• What are the interactions in quantum glasses?
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• Slow Relaxation and Equilibrium Dynamics in a 2 D Coulomb Glass: Demonstration of Stretched Exponential Energy Correlations
• Thermalization Processes in Interacting Anderson Insulators
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• Nonequilibrium transport and Electron-Glass effects in thin GexTe films
• Slow relaxation of magnetoresistance in doped p -GaAs/AlGaAs layers with partially filled upper Hubbard band
• Electron glass effects in amorphous NbSi films
• Evidence for thermal activation in the glassy dynamics of insulating granular aluminum conductance
• Slow relaxations of magnetoresistance in AlGaAs-GaAs quantum well structures quenched in a magnetic field
• Temperature-dependent disorder and magnetic field driven disorder: experimental observations for doped GaAs/AlGaAs quantum well structures
• Electron glass signatures up to room temperature in disordered insulators