Dust-Acoustic Wave Dispersion in Thermal Dusty Plasmas at Weak and Moderate Couplings

Strongly coupled systems occupying the transitional range between the Wigner crystal and fluid phases are the most dynamic constituents of the nature. Highly localized but strongly interacting elements in this phase possess enough thermal energy to trigger the transition between a variety of short to long range order phases. Nonlinear excitations are often carriers of proliferating structural modifications in the strongly coupled Yukawa systems. Well represented by laboratory dusty plasmas, these systems show explicit propagation of nonlinear shocks and solitary structures both in experiments and first principles simulations. The shorter scale length contributions remain absent at strong screening in the present approximate models, which nevertheless prescribe nonlinear solitary solutions that consequently lose their coherence in a numerical evolution of the system under the special implementation of a quasi-localized charge approximation (QLCA) formulation. The stable coherent structures self-consistently emerge following an initial transient in the numerical evolution that adapts QLCA approach to spatiotemporal domain for accessing the nonlinear excitations in the strong screening limit. The present [Formula: see text] limit of the existing Yukawa fluid models to show agreement with the experiment and molecular dynamical simulations has, therefore, been overcome, and the coherent nonlinear excitations have become characterizable up to [Formula: see text], before they become computationally challenging in the present implementation.

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Quasi-localized charge approximation approach for the nonlinear structures in strongly coupled Yukawa systems

Kumar

Sharma

2023

Physics of Plasmas

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Effect of Asymmetry Induced by Staggered Angle on the Rectification of Dust Particles in a Dusty Plasma Ratchet

Gao

Guo

Cai

et al. 2021

IEEE Trans. Plasma Sci.

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Converting random motion into directional motion of charged dust particles in plasma, i.e., the rectification, can be achieved by using a dusty plasma ratchet, in which the asymmetry of system plays a very important role. Here, we use different staggered angles between the inner and outer gears to control the asymmetry of system and further study experimentally the effect of the asymmetry induced by staggered angle on the rectification of dust particles in a dusty plasma ratchet. Our results show that the spatial distribution and the velocity of dust particles along the saw channel are nonuniform. Decreasing the asymmetry can reduce the flow of dust particle in the saw channel.

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Dust-Acoustic Wave Dispersion in Thermal Dusty Plasmas at Weak and Moderate Couplings

Cited by 2 publications

References 41 publications

Quasi-localized charge approximation approach for the nonlinear structures in strongly coupled Yukawa systems

Quasi-localized charge approximation approach for the nonlinear structures in strongly coupled Yukawa systems

Effect of Asymmetry Induced by Staggered Angle on the Rectification of Dust Particles in a Dusty Plasma Ratchet

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