Wave mode coupling due to plasma wakes in two-dimensional plasma crystals: In-depth view

Couëdel, L.; Zhdanov, S. K.; Ivlev, A. V.; Nosenko, V.; Thomas, H. M.; Morfill, G. E.
August 2011
Physics of Plasmas;Aug2011, Vol. 18 Issue 8, p083707
Academic Journal
Experiments with two-dimensional (2D) plasma crystals are usually carried out in rf plasma sheaths, where the interparticle interactions are modified due to the presence of plasma wakes. The wake-mediated interactions result in the coupling between wave modes in 2D crystals, which can trigger the mode-coupling instability and cause melting. The theory predicts a number of distinct fingerprints to be observed upon the instability onset, such as the emergence of a new hybrid mode, a critical angular dependence, a mixed polarization, and distinct thresholds. In this paper we summarize these key features and provide their detailed discussion, analyze the critical dependence on experimental parameters, and highlight the outstanding issues.


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