Abstract
Spectra of phonons with out-of-plane polarization were studied experimentally in a 2D plasma crystal. The dispersion relation was directly measured for the first time using a novel method of particle imaging. The out-of-plane mode was proven to have negative optical dispersion at small wave numbers, comparison with theory showed good agreement. The effect of the plasma wakes on the dispersion relation is briefly discussed.
- Received 29 July 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.215001
©2009 American Physical Society
Synopsis
Collective action in dusty plasma
Published 23 November 2009
A new phonon mode has been observed in a two-dimensional plasma crystal.
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