Screened dielectric response of sliding charge-density waves
- 15 August 1987
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 36 (6) , 3108-3116
- https://doi.org/10.1103/physrevb.36.3108
Abstract
The linear response of a model of deformable charge-density waves pinned by weak disorder is calculated, including the screening effects of free carriers and using a simple model for the distribution of pinned modes. Owing to the screening of localized pinned collective oscillations, the dielectric function develops a low-frequency loss peak in addition to the expected absorption close to the pinning frequency. These results provide a quantitative explanation of the apparent discrepancies between low-frequency (≲10 MHz) electrical measurements and higher-frequency (microwave or infrared) measurements of the dielectric response. Implications for measurements of the nonlinear dc conductivity are discussed.Keywords
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