Phonon spectra of two-dimensional liquid dusty plasmas on a one-dimensional periodic substrate

Abstract

We investigate the phonon spectra of two-dimensional liquid dusty plasmas on a one-dimensional periodic substrate using numerical simulations. The propagation of the waves across the potential wells of the substrate is inhibited due to the confinement of the dust particles by the substrate minima. If the substrate wells are narrow or deep, one-dimensional chains of particles are formed in each minima, and the longitudinal motion of an individual chain dominates the propagation of waves along the potential wells of the substrate. Increasing the width or decreasing the depth of the substrate minima allows the particles to buckle into a zig-zag structure, and the resulting spectra develop two branches, one for sloshing motion and one for breathing motion. The repulsion between neighboring dust particles produces backward propagation of the sloshing wave for small wave numbers.

arXiv comment7 pages, 6 figures

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Cited by in corpus (9)

• Structures and Diffusion of Two Dimensional Dusty Plasmas on One Dimensional Periodic Substrates
• Depinning dynamics of two-dimensional dusty plasmas on a one-dimensional periodic substrate
• Continuous and Discontinuous Transitions in the Depinning of Two-Dimensional Dusty Plasmas on a One-Dimensional Periodic Substrate
• Directional Locking in a 2D Yukawa Solid Modulated by a 2D Periodic Substrate
• Phonon spectra of a two-dimensional solid dusty plasma modified by two-dimensional periodic substrates
• Oscillation-like diffusion of two-dimensional liquid dusty plasmas on one-dimensional periodic substrates with varied widths
• Observation of fast sound in two-dimensional dusty plasma liquids
• Superlubric-pinned transition of a two-dimensional solid dusty plasma under a periodic triangular substrate
• Dynamical commensuration effect in a two-dimensional Yukawa solid modulated by periodic substrates