Coupling of non-crossing wave modes in a two-dimensional plasma crystal

Abstract

We report an experimental observation of coupling of the transverse vertical and longitudinal in-plane dust-lattice wave modes in a two-dimensional complex plasma crystal in the absence of mode crossing. A new large diameter rf plasma chamber was used to suspend the plasma crystal. The observations are confirmed with molecular-dynamics simulations. The coupling manifests itself in traces of the transverse vertical mode appearing in the measured longitudinal spectra and vice versa. We calculate the expected ratio of the trace to the principal mode with a theoretical analysis of the modes in a crystal with finite temperature and find good agreement with the experiment and simulations.

arXiv comment4 figures, 5 pages, accepted for publication in PRL Nov 2017

References in corpus (6)

• Direct observation of mode-coupling instability in two-dimensional plasma crystals
• Dynamical correlations and collective excitations of Yukawa liquids
• Wave mode coupling due to plasma wakes in two-dimensional plasma crystals: In-depth view
• First direct measurement of optical phonons in 2D plasma crystals
• Evanescent wave interference and the total transparency of a warm high-density plasma slab
• Anisotropic confinement effects in a two-dimensional plasma crystal

Cited by in corpus (5)

• Thermal runaway in two-dimensional complex plasma crystals
• Stability of two-dimensional complex plasma monolayers in asymmetric capacitively-coupled radio-frequency discharges
• Experimental observation of a first order phase transition in a complex plasma mono-layer crystal
• Fractional Laplacian Spectral Approach to Turbulence in a Dusty Plasma Monolayer
• Dispersion relation of square lattice waves in a two-dimensional binary complex plasma