Large-amplitude acoustic solitary waves in a Yukawa chain

Abstract

We experimentally study the excitation and propagation of acoustic solitary waves in a one-dimensional dusty plasma (i.e. a Yukawa chain) with n = 65 particles interacting through a screened Coulomb potential. The lattice constant a = 1.02 ± 0.02 mm. Waves are launched by applying a 100 mW laser pulse to one end of the chain for laser pulse durations from 0.10 to 2.0 s. We observe damped solitary waves which propagate for distances 30a with an acoustic speed c s = 11.5 ± 0.2 mm s −1. The maximum velocity perturbation increases with laser pulse duration for durations 0.5 s and then saturates at ≈15 %. The wave speed is found to be independent of the maximum amplitude, indicating that the formation of nonlinear solitons is prevented by neutral-gas damping.

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

“…Over the past decades, the phonon spectra have been obtained in both experiments [36][37][38][39][40] and simulations [41][42][43] , including the compressional (longitudinal) mode and the shear (transverse) mode, and the results are consistent with the theoretical dispersion relations. In addition, the phonon spectra or dispersion relations of a 1D chain or a ring of dusty plasma have been investigated experimentally [44][45][46][47][48] and theoretically 49,50 . Similar studies have also been performed using two chains or rings as well as mixed Yukawa particles [51][52][53][54] .…”

Molecular dynamics investigation of soliton propagation in a two‐dimensional Yukawa liquid

“…In three-dimensional dusty plasmas under micro-gravity conditions solitons could be launched as well, as reported in [30]. Solitary waves in one-dimensional dust particle chains were studied in [31].…”