Bulletin of the American Physical Society
2005 APS March Meeting
Monday–Friday, March 21–25, 2005; Los Angeles, CA
Session V2b: Dynamical Heterogeneities and Quantum Glassiness in Electronic Systems |
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Sponsoring Units: DCMP GMAG Chair: Clare Yu, University of California-Irvine Room: LACC 151 |
Thursday, March 24, 2005 1:03PM - 1:39PM |
V2b.00001: Anderson Insulators as Quantum Glasses Invited Speaker: The out-of-equilibrium transport properties of Anderson insulators exhibit many glassy features. These include slow relaxation, slow approach to a steady state, ageing, and other memory effects that are common characteristics of other types of glasses. The typical relaxation time of this, so called electron glass, may be controlled by disorder, magnetic field, and carrier concentration. Due to the absence of metallic screening, the inter-electron interaction strength increases with the concentration of carriers, which in turn slows down the relaxation processes in this medium. Interestingly, in contrast with most other glasses, the system dynamics does not slow down upon cooling below a `glass-temperature,' a feature consistent with the behavior expected of a quantum glass. [Preview Abstract] |
Thursday, March 24, 2005 1:39PM - 2:15PM |
V2b.00002: The Electron Glass in a Switchable Mirror: Relaxation, Aging and Universality Invited Speaker: At room temperature, the rare earth hydride YH$_{3-\delta}$ can be transformed reversibly from shiny metal to transparent insulator by simply changing the surrounding hydrogen pressure. At low temperature, it can be tuned with high resolution through the metal- insulator transition by illumination with ultraviolet light. The transition is dominated by strong electron-electron interactions, with transport in the insulator sensitive to both a Coulomb gap and persistent quantum fluctuations. Via a systematic variation of UV illumination time, photon flux, separation between electrons, and temperature, we demonstrate that polycrystalline YH$_{3-\delta}$ serves as a model system for studying the properties of the interacting electron glass. Prominent among its features are logarithmic relaxation, aging, and universal scaling of the conductivity. [Preview Abstract] |
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