Dynamical response of a pinned two-dimensional Wigner crystal

Details Dynamical response of a pinned two-dimensional Wigner crystal Dynamical response of a pinned two-dimensional Wigner crystal

2000-04-20

arxiv.org/abs/cond-mat/0004343v1

Phys. Rev. B 62, 7553 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

19 pages, 11 figures. Supersedes cond-mat/9904245

Scientific paper

We re-examine a long-standing problem of a finite-frequency conductivity of a weakly pinned two-dimensional classical Wigner crystal. In this system an inhomogeneously broadened absorption line (pinning mode) centered at disorder and magnetic field dependent frequency $\omega_p$ is known to appear. We show that the relative linewidth $\Delta \omega_p / \omega_p$ of the pinning mode is of the order of one in weak magnetic fields, exhibits a power-law decrease in intermediate fields, and eventually saturates at a small value in strong magnetic fields. The linewidth narrowing is due to a peculiar mechanism of mixing between the stiffer longitudinal and the softer transverse components of the collective excitations. The width of the high-field resonance proves to be related to the density of states in the low-frequency tail of the zero-field phonon spectrum. We find a qualitative agreement with recent experiments and point out differences from the previous theoretical work on the subject.

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