Self-diffusion in two-dimensional quasimagnetized rotating dusty plasmas

Hartmann, Péter; Reyes, Jorge Carmona; Kostadinova, Eva; Matthews, L. S.; Hyde, Truell; Masheyeva, R. U.; Dzhumagulova, K. N.; Рамазанов, Т. С.; Ott, Torben; Kählert, H.; Bönitz, M.; Korolov, Ihor; Donkó, Zoltán

doi:10.1103/physreve.99.013203

Cited by 44 publications

(19 citation statements)

References 47 publications

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“…In this work, by molecular dynamics (MD) simulation, we investigate the diffusion process in 2D equilibrium Yukawa liquids. Investigating the diffusion in 2D Yukawa liquids has attracted a great deal of interest over the last decade [20][21][22][23][24][25][26][27][28][29][30][31]. We find that the distribution function of dust particles displacement G s (r, t) is not Gaussian as expected for a Fickian diffusion while the mean-squared displacement appears Fickian (linear with time).…”

Section: Introductionmentioning

confidence: 94%

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Fickian yet non-Gaussian diffusion in two-dimensional Yukawa liquids

Ghannad

2019

Phys. Rev. E

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We investigate Fickian diffusion in two-dimensional (2D) Yukawa liquids using molecular dynamics simulations. We compute the self-van Hove correlation function Gs(r, t), and self-intermediate scattering function Fs(k, t) and compare these functions with those obtained from mean-squared displacement MSD using the Gaussian approximation. According to this approximation, a linear MSD with time implies a Gaussian behavior for Gs(r, t) and Fs(k, t) at all times. Surprisingly, we find that these functions deviate from Gaussian at intermediate time scales, indicating the failure of the Gaussian approximation. Furthermore, we quantify these deviations by the non-Gaussian parameter, and we find that the deviations increase with decreasing the temperature of the liquid. The origin of the non-Gaussian behavior may be the heterogeneous dynamics of dust particles observed in 2D Yukawa liquids.

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Section: Introductionmentioning

confidence: 94%

“…We integrated the equation of the motion mr i = −∇Σ j φ ij for N = 1024 particles, where φ ij is the Yukawa pair interaction potential [9,10]. An equilibrium Yukawa system can be characterized by two dimensionless parameters [22,39]:…”

Section: Model and Simulation Techniquementioning

confidence: 99%

Fickian yet non-Gaussian diffusion in two-dimensional Yukawa liquids

Ghannad

2019

Phys. Rev. E

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“…We integrated the equation of the motion mr i = −∇Σ j φ ij for N = 1024 dust particles, where m is the mass of the dust particle, and φ ij is the Yukawa pair interaction potential 16,17 . An equilibrium Yukawa system can be characterized by two dimensionless parameters 26,27 . The first is the screening parameter κ = a/λ D .…”

Section: Model and Simulation Techniquementioning

confidence: 99%

Identification of time scales of the violation of the Stokes-Einstein relation in Yukawa liquids

Ghannad

2021

Preprint

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We investigate the origin of the violation of the Stokes-Einstein (SE) relation in two-dimensional Yukawa liquids. Using comprehensive molecular dynamics simulations, we identify the time scales supporting the violation of the SE relation D ∝ (η/T ) −1 , where D is the self-diffusion coefficient and η is the shear viscosity. We first compute the self-intermediate scattering function F s (k, t), the non-Gaussian parameter α 2 , and the autocorrelation function of the shear stress C η (t). The timescales obtained from these functions are included the structural relaxation time τ α , the peak time of the non-Gaussian parameter τ α2 , and the shear stress relaxation time τ η . We find that τ η is coupled with D for all temperatures indicating the SE preservation, however, τ α and τ α2 are decoupled with D at low temperatures indicating the SE violation. Surprisingly, we find that the origins of this violation are related to the non-exponential behavior of the autocorrelation function of the shear stress and non-Gaussian behavior of the distribution function of particle displacements. These results confirm dynamic heterogeneity that occurs in two-dimensional Yukawa liquids that reflects the presence of regions in which dust particles move faster than the rest when the liquid cools to below the phase transition temperature.

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“…Due to the large diversity of physical and chemical phenomena involved plasma processes related to self-organization are rather complicated for their theoretical understanding [14,15]. Theoretical models of plasma discharge in ambient gas, including the most basic ones, admit multiple solutions existing for the same discharge current.…”

Section: Self-organization In Plasma Dischargesmentioning

confidence: 99%

Cold atmospheric plasma with self-organized patterns for cancer therapy

Chen¹

2019

Front Nanosci Nanotech

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This paper overviews the formation of the self-organization plasma structures and potential applications in cancer therapy. Representative experimental evidence of self-organized patterns (SOPs) in diverse types of plasma discharges in contact with liquid electrodes are reviewed. SOP plasma in contact with liquids show marked sensitivity of pattern formation at the interphase to broad range of controlling parameters, such as driving current, electrolyte conductivity, gas length, gas species, and gas flow rate. Several studies suggest that reactive species formed in self-organized plasma structure are effective against cancer cells both in vitro and vivo.

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Self-diffusion in two-dimensional quasimagnetized rotating dusty plasmas

Cited by 44 publications

References 47 publications

Fickian yet non-Gaussian diffusion in two-dimensional Yukawa liquids

Fickian yet non-Gaussian diffusion in two-dimensional Yukawa liquids

Identification of time scales of the violation of the Stokes-Einstein relation in Yukawa liquids

Cold atmospheric plasma with self-organized patterns for cancer therapy

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