Structural and dynamical aspects of small three-dimensional spherical Coulomb clusters

Apolinario, S. W. S.; Partoens, B.; Peeters, F. M.

doi:10.1088/1367-2630/9/8/283

Cited by 45 publications

(63 citation statements)

References 43 publications

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“…[96] and the results were later confirmed by other groups, e.g. [97,98]. The length of the bold lines is proportional to the occurrence frequency of a state in a total of 5000 runs.…”

Section: Ground and Metastable Statessupporting

confidence: 74%

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Structure and Phase Transitions of Yukawa Balls

Baumgartner

Block

Bönitz

2009

Contrib. Plasma Phys.

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In this review, an overview of structural properties and phase transitions in finite spherical dusty (complex) plasma crystals -so-called Yukawa balls -is given. These novel kinds of Wigner crystals can be directly analyzed experimentally with video cameras. The experiments clearly reveal a shell structure and allow to determine the shell populations, to observe metastable states and transitions between configurations as well as phase transitions. The experimental observations of the static properties are well explained by a rather simple theoretical model which treats the dust particles as being confined by a parabolic potential and interacting via an isotropic Yukawa pair potential. The excitation properties of the Yukawa balls such as normal modes and the dynamic behavior, including the time-dependent formation of the crystal requires, in addition, to include the effect of friction between the dust particles and the neutral gas. Aside from first-principle molecular dynamics and Monte Carlo simulations several analytical approaches are reviewed which include shell models and a continuum theory. A summary of recent results and theory-experiment comparisons is given and questions for future research activities are outlined.

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“…[96] and the results were later confirmed by other groups, e.g. [97,98]. The length of the bold lines is proportional to the occurrence frequency of a state in a total of 5000 runs.…”

Section: Ground and Metastable Statessupporting

confidence: 74%

“…This quantity has been successully applied to many finite systems and also to Yukawa balls [89,98,100,107], an example is shown in the left part of Fig. 10.…”

Section: Finite Temperature Effects Solid-liquid Phase Transitionmentioning

confidence: 99%

Structure and Phase Transitions of Yukawa Balls

Baumgartner

Block

Bönitz

2009

Contrib. Plasma Phys.

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“…Occasional occurrences of four and seven neighbors can be associated with crystal defects, e.g. [22]. For large particle numbers, N > 1000, boundary effects and the spherical symmetry caused by the confinement should become gradually less important [38], and the crystal structure should approach that of macroscopic Yukawa crystals which is either of bcc-or fcc-type [31].…”

Section: Discussionmentioning

confidence: 99%

“…A stable state is reached when the dimensionless force on each particle is zero (less than 10 −6 in the calculations). It was observed previously for Coulomb systems that there exist different states with the same shell configuration, which differ with respect to the particle arrangement within the shells (fine structure) [19,21,22]. Here, these energy differences which are less than 10 −8 in dimensionless units will not be resolved since this would blow up the whole analysis and we record only the energetically lowest shell configurations for a given value of κ.…”

Section: Model and Simulation Techniquementioning

confidence: 99%

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Ground states of finite spherical Yukawa crystals

et al. 2008

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On the Coulomb-dipole transition in mesoscopic classical and quantum electron-hole bilayers P Ludwig, K Balzer, A Filinov et al. Abstract. Small three-dimensional strongly coupled clusters of charged particles in a spherical confinement potential arrange themselves in nested concentric shells. If the particles are immersed into a background plasma the interaction is screened. The cluster shell configuration is known to be sensitive to the screening strength. With increased screening, an increased population of the inner shell(s) is observed. Here, we present a detailed analysis of the ground state shell configurations and configuration changes in a wide range of screening parameters for clusters with particle numbers N in the range of 11 to 60. We report three types of anomalous behaviors which are observed upon increase of screening, at fixed N or for an increase of N at fixed screening. The results are obtained by means of extensive first principle molecular dynamics simulations.

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Dynamical Heterogeneities in 2D Dusty Plasma Liquids at the Discrete Level

Chan

Lin

2009

Contrib. Plasma Phys.

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Down to the discrete microscopic level, the liquid is neither homogeneous nor completely disordered. The interplay of mutual coupling and thermal agitation makes the system support short range structural order, and avalanche-type cooperative hopping excitations which lead to structural arrangement. The rich dynamical behaviors of spatio-temporal heterogeneities are still poorly understood because of the lack of proper tools for direct visualization. The dusty plasma liquid can be self-organized by negatively charged micrometer sized dusts suspending in a low-pressure rf discharge background. Its sub-mm inter-particle distance and the tens of second thermal relaxation time make it a proper system to mimic and understand the generic spatio-temporal behaviors of the liquid at the discrete kinetic level through direct optical video-microscopy. In this paper, we briefly review the recent studies on the dynamical heterogeneities of the cold 2D dusty plasma liquids at the discrete level. The effects of mutual interaction, thermal agitation, external shear, and tight confinement on micro-motion, anomalous diffusion, avalanche-type excitations of hopping clusters and defect clusters, structural ordering and rearrangement, and visco-elastic responses are presented and discussed.

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Structural and dynamical aspects of small three-dimensional spherical Coulomb clusters

Cited by 45 publications

References 43 publications

Structure and Phase Transitions of Yukawa Balls

Structure and Phase Transitions of Yukawa Balls

Ground states of finite spherical Yukawa crystals

Dynamical Heterogeneities in 2D Dusty Plasma Liquids at the Discrete Level

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