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Optical excitation of Electron-Glasses

By Z. Ovadyahu

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.Comment: 10 pages 12 figure

Topics: Condensed Matter - Strongly Correlated Electrons
Year: 2011
DOI identifier: 10.1103/PhysRevB.83.235126
OAI identifier: oai:arXiv.org:1105.1350
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