Memory effects in transport through a hopping insulator: Understanding two-dip experiments

Abstract

We discuss memory effects in the conductance of hopping insulators due to slow rearrangements of many-electron clusters leading to formation of polarons close to the electron hopping sites. An abrupt change in the gate voltage and corresponding shift of the chemical potential change populations of the hopping sites, which then slowly relax due to rearrangements of the clusters. As a result, the density of hopping states becomes time dependent on a scale relevant to rearrangement of the structural defects leading to the excess time dependent conductivity.

References in corpus (7)

• The glass transition and the Coulomb gap in electron glasses
• Mean field theory for the three-dimensional Coulomb glass
• Symmetrical field effect and slow electron relaxation in granular aluminium
• Many electron theory of 1/f-noise in hopping conductivity
• Relaxation dynamics in quantum electron-glasses
• Temperature and field dependence of Dynamics in the Electron-Glass
• The Electron-Glass in samples approaching the Mesoscopic regime

Cited by in corpus (15)

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• Intrinsic electron-glass effects in strongly-localized thallium-oxide films
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• 1/f noise and slow relaxations in glasses
• Transition to exponential relaxation in weakly-disordered electron-glasses
• Slow relaxation of magnetoresistance in doped p -GaAs/AlGaAs layers with partially filled upper Hubbard band
• Slow relaxations of magnetoresistance in AlGaAs-GaAs quantum well structures quenched in a magnetic field
• Relaxation dynamics of the three-dimensional Coulomb Glass model
• Electron glass signatures up to room temperature in disordered insulators
• The effect of screening on the relaxation dynamics in the Coulomb glass
• Low frequency excitations in the Coulomb Glass: numerical analysis using the avalanche method
• Anomalous thermal activation of the electron glass dynamics in a-InOx and granular aluminum
• Relaxation of the Random Site Coulomb glass Model in Two Dimensions