Collective Modes in Two Dimensional Binary Yukawa Systems

Abstract

We analyze via theoretical approaches and molecular dynamics simulations the collective mode structure of strongly coupled two-dimensional binary Yukawa systems, for selected density, mass and charge ratios, both in the liquid and crystalline solid phases. Theoretically, the liquid phase is described through the Quasi-Localized Charge Approximation (QLCA) approach, while in the crystalline phase we study the centered honeycomb and the staggered rectangular crystal structures through the standard harmonic phonon approximation. We identify "longitudinal" and "transverse" acoustic and optic modes and find that the longitudinal acoustic mode evolves from its weakly coupled counterpart in a discontinuous non-perturbative fashion. The low frequency acoustic excitations are governed by the oscillation frequency of the average atom, while the high frequency optic excitation frequencies are related to the Einstein frequencies of the systems.

35 pages, 17 figures, submitted to Phys. Rev. E

References in corpus (11)

• Dynamical correlations and collective excitations of Yukawa liquids
• Reentrant transitions in colloidal or dusty plasma bilayers
• Stable crystalline lattices in two-dimensional binary mixtures of dipolar particles
• Dynamics of two-dimensional dipole systems
• Binary crystals in two-dimensional two-component Yukawa mixtures
• Correlational Origin of the Roton Minimum
• Structural and dynamical properties of a quasi-one-dimensional classical binary system
• Acoustic dispersion in a two-dimensional dipole system
• Strong Coupling Effects in Binary Yukawa Systems
• Two-component mixture of charged particles confined in a channel: melting
• Coupling parameter lower bound in Yukawa-Vlasov plasmas

Cited by in corpus (6)

• Slow dynamics in a quasi-two-dimensional binary complex plasma
• Dynamics of two-dimensional complex plasmas in a magnetic field
• Dispersion relation of square lattice waves in a two-dimensional binary complex plasma
• Analysis of dependent scattering mechanism in hard-sphere Yukawa random media
• Second Plasmon and Collective Modes in Binary Coulomb Systems
• Coupled dynamics in binary mixtures of colloidal Yukawa systems