Optical excitation of Electron-Glasses

Abstract

Electron-glasses can be readily driven far from equilibrium by a variety of means. Several mechanisms to excite the system and their relative merits are reviewed. In this study we focus on the process of exciting electron-glasses by interaction with near infrared radiation. The efficiency of this protocol varies considerably among different electron-glasses, but it only weakly depends on their resistance at liquid helium temperatures. A dramatic enhancement of the excitation efficiency is observed upon doping crystalline indium-oxide with Au. Some enhancement is observed also in samples doped with Pb but this enhancement fades away with time unlike the situation in the Au-doped samples. Several structural and analytical tools are used to characterize the changes in the materials that may be responsible for these effects. Possible routes by which high-frequency electromagnetic fields take the system far from equilibrium are discussed.

10 pages 12 figures

References in corpus (16)

• The glass transition and the Coulomb gap in electron glasses
• Time Dependent Development of the Coulomb Gap
• A mean-field model for the electron glass dynamics
• Symmetrical field effect and slow electron relaxation in granular aluminium
• The Memory Effect in Electron Glasses
• History-dependent relaxation and the energy scale of correlation in the Electron-Glass
• Temperature and field dependence of Dynamics in the Electron-Glass
• Slow conductance relaxations; Distinguishing the Electron Glass from extrinsic mechanisms
• Non-equlibrium effects in transport through quantum dots
• Coexistence of anomalous field effect and mesoscopic conductance fluctuations in granular aluminium
• The Electron-Glass in samples approaching the Mesoscopic regime
• Conductance relaxation in the Electron-Glass; Microwaves versus infra-red response
• Intrinsic electron-glassiness in strongly-localized Be films
• Ultrafast (but Many-Body) Relaxation in a Low-Density Electron Glass
• Non-ohmicity and energy relaxation in diffusive 2D metals
• Impairing the memory of an electron-glass by IR excitation

Cited by in corpus (6)

• Suppression of inelastic electron-electron scattering in Anderson Insulators
• Electron Glass in a three-dimensional system
• Coexistence of Electron-Glass Phase and Persistent Photoconductivity in GeSbTe Compounds
• Suppressing quantum effects by optically driven nonequilibrium phonons
• Long-range influence of manipulating disordered-insulators locally
• Onset of nonequilibrium in a driven Anderson insulator