Description of longitudinal modes in moderately coupled Yukawa systems with the static local field correction

Abstract

In moderately coupled Yukawa fluids, longitudinal mode dispersion is determined by the competition between kinetic and potential effects. In a recent paper [Khrapak and Couëdel, Phys. Rev. E 102, 033207 (2020)], a semi-phenomenological dispersion relation was constructed by the ad-hoc addition of the Bohm-Gross kinetic term to the generalized instantaneous excess bulk modulus, which showed very good agreement with simulations. In this paper, a nearly identical dispersion relation is derived in a rigorous manner based on a dielectric formulation with static local field corrections. At moderate coupling, this formalism is revealed to be more accurate than other successful theoretical approaches.

6 pages, 3 figures

References in corpus (8)

• Statics and Dynamics of Strongly Charged Soft Matter
• Dynamical correlations and collective excitations of Yukawa liquids
• Fluid approach to evaluate sound velocity in Yukawa systems (complex plasmas)
• Onset of transverse (shear) waves in strongly-coupled Yukawa fluids
• Isomorph-based empirically modified hypernetted-chain approach for strongly coupled Yukawa one-component plasmas
• Unified description of sound velocities in strongly coupled Yukawa systems of different spatial dimensionality
• Dispersion relations of Yukawa fluids at weak and moderate coupling
• Elastic properties of dense hard-sphere fluids

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• Revisiting the Vashishta-Singwi dielectric scheme for the warm dense uniform electron fluid
• Variational approach to Yukawa fluids. II. Instantaneous elastic moduli and sound velocities