J. Phys. IV France 09 (1999) Pr10-219-Pr10-221
Unconventionally sharp dynamic resonances from a disordered Wigner crystalM.M. Fogler1 and D.A. Huse2
1 School of Natural Sciences, Institute for Advanced Study, Olden Lane, Princeton, New Jersey 08540, U.S.A.
2 Physics Department, Princeton University, Princeton, New Jersey 08544, U.S.A.
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 ωp, 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.
© EDP Sciences 1999