Phonon spectrum in a plasma crystal |
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Authors: | Nunomura S Goree J Hu S Wang X Bhattacharjee A Avinash K |
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Institution: | Department of Physics and Astronomy, The University of Iowa, Iowa City, Iowa 52242, USA. |
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Abstract: | The Fourier spectra of longitudinal and transverse waves corresponding to random particle motion were measured in a two-dimensional plasma crystal. The crystal was composed of negatively charged microspheres immersed in a plasma at a low gas pressure. The phonons were found to obey a dispersion relation that assumes a Yukawa interparticle potential. The crystal was in a nonthermal equilibrium, nevertheless phonon energies were almost equally distributed with respect to wave number over the entire first Brillouin zone. |
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