Dynamical response of a weakly pinned two-dimensional Wigner crystal

Abstract

Motivated by puzzling results of recent experiments, we re-examine the response of a weakly pinned two-dimensional Wigner crystal to a uniform AC electric field. We confirm that at some disorder and magnetic field dependent frequency ${\omega }_p$, an inhomogeneously broadened absorption line emerges. Although the line is conventionally broad in zero magnetic field, in strong fields it appears as a sharp resonance whose width is related to the density of states in the low-frequency tail of the zero-field phonon spectrum. This behavior originates due to the long-range Coulomb interactions.

Superseded by cond-mat/0004343

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• Absence of Two-Dimensional Bragg Glasses
• Dynamical properties of the pinned Wigner crystal
• Density of states in the non-hermitian Lloyd model
• Disordered XY models and Coulomb gases: renormalization via traveling waves
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