Two-Dimensional Yukawa Liquids: Correlation and Dynamics

Kalman, G.; Hartmann, P.; Donkó, Zoltán; Rosenberg, M.

doi:10.1103/physrevlett.92.065001

Cited by 184 publications

(240 citation statements)

References 32 publications

(32 reference statements)

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“…There are other realizations of a binary Yukawa system in dusty plasmas [33][34][35] and metallic mixtures [36] or amorphous silica [37]. In fact, the binary Yukawa model has been widely used and employed to investigate effective interactions [38], fluid-fluid phase separation [31,39,40], vitrification [41][42][43][44][45] and transport properties [46].…”

Section: Introductionmentioning

confidence: 99%

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Allahyarov

Löwen

2009

J. Phys.: Condens. Matter

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Based on primitive model computer simulations with explicit microions, we calculate the effective interactions in a binary mixture of charged colloids with species A and B for different size and charge ratios. An optimal pairwise interaction is obtained by fitting the many-body effective forces. This interaction is close to a Yukawa (or Derjaguin-Landau-Verwey-Overbeek (DLVO)) pair potential but the AB cross-interaction is different from the geometric mean of the two direct AA and BB interactions. As a function of charge asymmetry, the corresponding nonadditivity parameter is first positive, then significantly negative and is then positive again. We finally show that an inclusion of nonadditivity within an optimal effective Yukawa model gives better predictions for the fluid pair structure than DLVO theory.

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Section: Introductionmentioning

confidence: 99%

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Allahyarov

Löwen

2009

J. Phys.: Condens. Matter

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“…Their experimental findings also lent credence to the applicability of fluid models for describing wave motion in dusty plasmas. Subsequent theoretical [16][17][18][19][20] and particle simulation [21] studies have highlighted the fact that correlation effects can be important even in the modestly coupled regime in the near liquid state (Γ ∼ 10) and can lead to a turnover effect of the dispersion curve for DAWs at higher wave numbers and create a regime where ∂ω/∂k < 0. However as has been pointed out in [16], similar effects can also arise due to strong dust-neutral collisions and pose a challenge for an unambiguous experimental detection of dust-dust correlation effects for longitudinal waves.…”

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confidence: 99%

Experimental observation of strong coupling effects on the dispersion of dust acoustic waves in a plasma

et al. 2007

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The dispersion properties of low frequency dust acoustic waves in the strong coupling regime are investigated experimentally in an argon plasma embedded with a mixture of kaolin and M nO2 dust particles. The neutral pressure is varied over a wide range to change the collisional properties of the dusty plasma. In the low collisional regime the turnover of the dispersion curve at higher wave numbers and the resultant region of ∂ω/∂k < 0 are identified as signatures of dust-dust correlations. In the high collisional regime dust neutral collisions produce a similar effect and prevent an unambiguous identification of strong coupling effects.PACS numbers: 52.25. Zb, 52.35.Fp, 52.25.Ub Dust acoustic waves (DAWs), which are the analogs of ion acoustic waves in a dusty plasma, have received a great deal of attention in recent years. Their linear and nonlinear propagation characteristics have been the subject of a large number of theoretical [1][2][3][4][5] and experimental [6][7][8][9][10][11][12] investigations. One of the important and fundamental questions related to their dispersion properties concerns the effect of dust-dust correlations. These correlation effects are deemed to be important because dusty plasmas are usually in the strongly coupled regime on account of the large amount of charge on each dust particle and its relatively low thermal velocity., the ratio of the dust Coulomb energy to the dust thermal energy is widely used as a measure of the amount of coupling. Here, Z d , d, T d , λ p denote the dust charge, the interparticle distance, the dust particle temperature and the plasma Debye length respectively. The value of this parameter, which is based on the Yukawa model, provides a broad indication of the phase of a dusty plasma i.e. whether it is in a gaseous (Γ < 1), fluid (1 < Γ < Γ c ) or solid state (Γ > Γ c ). Here Γ c is the critical value of Γ marking a phase transition point. It should be mentioned that a number of recent works [13,14] have suggested important modifications to the expression for Γ and Γ c near a critical curve. In general, when Γ >> 1 in a dusty plasma, dust-dust correlations can lead to the development of short range order in the system which keeps decaying and reforming in time. Such correlation effects can bring about significant modifications in the collective properties of the strongly coupled dusty plasma [15][16][17][18]. The influence of dust-dust correlation on DAWs was addressed in an early experiment by Pieper and Goree [8] who studied the propagation of DAWs in a dusty plasma that was close to a crystalline state. The expectation was that the linear dispersion relation of the excited compressive waves would be close to dust-lattice waves -DLWs (evidence of a strongly correlated medium) rather than that of DAWs which are typically found in a gaseous weakly coupled plasma. To their surprise they found that the dispersion properties were well explained by collisionally damped DAWs and showed no resemblance to DLWs. Their experimental findings also lent credence to t...

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“…Coulomb repulsion is shielded with a screening length λ D [21,22]. The elastic properties of the crystalline solid arise from interparticle repulsion and can be characterized by the phonon spectrum for longitudinal and transverse waves [23], which have a frequency close to the nominal 2D dust plasma frequency ω pd [24]. The solid can be melted, to form a liquid, by laser manipulation [25,26].…”

mentioning

confidence: 99%

“…The suspension had a diameter ≈ 52 mm and contained > 5400 particles. The lattice constant b = 0.67 mm corresponds to a Wigner-Seitz radius [24] a = 0.35 mm.…”

mentioning

confidence: 99%

Viscoelasticity of 2D Liquids Quantified in a Dusty Plasma Experiment

2010

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The viscoelasticity of two-dimensional liquids is quantified in an experiment using a dusty plasma. An experimental method is demonstrated for measuring the wavenumber-dependent viscosity, η(k), which is a quantitative indicator of viscoelasticity. Using an expression generalized here to include friction, η(k) is computed from the transverse current autocorrelation function (TCAF), which is found by tracking random particle motion. The TCAF exhibits an oscillation that is a signature of elastic contributions to viscoelasticity. Simulations of a Yukawa liquid are consistent with the experiment.

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Two-Dimensional Yukawa Liquids: Correlation and Dynamics

Cited by 184 publications

References 32 publications

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Experimental observation of strong coupling effects on the dispersion of dust acoustic waves in a plasma

Viscoelasticity of 2D Liquids Quantified in a Dusty Plasma Experiment

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