Ground states of finite spherical Yukawa crystals

Baumgartner, H.; Asmus, D.; Golubnychiy, V.; Ludwig, P.; Kählert, H.; Bönitz, M.

doi:10.1088/1367-2630/10/9/093019

Cited by 24 publications

(24 citation statements)

References 40 publications

(147 reference statements)

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“…We consider systems with 31 and 27 particles as was done in the experiment. As another example we used a cluster with 40 particles because here the ground state shell configuration abruptly changes from (34,6) to (32,8) at κ = 0.415 as the screening parameter is increased -without the configuration (33,7) ever being the ground state [8]. This gives rise to the question of how often this configuration can actually occur in experiments.…”

Section: Molecular Dynamics (Md)mentioning

confidence: 99%

Probability of metastable configurations in spherical three-dimensional Yukawa crystals

et al. 2008

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Recently the occurrence probabilities of ground-and metastable states of three-dimensional Yukawa clusters with 27 and 31 particles have been analyzed in dusty plasma experiments [Block et al., Physics of Plasmas 15, 040701 (2008)]. There it was found that, in many cases, the ground state appeared substantially less frequently than excited states. Here we analyze this question theoretically by means of molecular dynamics (MD) and Monte Carlo simulations and an analytical method based on the canonical partition function. We confirm that metastable states can occur with a significantly higher probability than the ground state. The results strongly depend on the screening parameter of the Yukawa interaction and the damping coefficient used in the MD simulations. The analytical method allows one to gain insight into the mechanisms being responsible for the occurrence probabilities of metastable states in strongly correlated finite systems.

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Section: Molecular Dynamics (Md)mentioning

confidence: 99%

Probability of metastable configurations in spherical three-dimensional Yukawa crystals

et al. 2008

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“…They can be regarded as the analog to confined Coulomb clusters in ion traps [3,4] with the difference being the screened particle interaction [5]. Recent experimental and theoretical work has been concerned with their ground state configurations [6][7][8][9], the occurrence of metastable states [10][11][12], time dependent shell formation [13] and the investigation of their normal modes [14][15][16], for an overview see [17].…”

Section: Introductionmentioning

confidence: 99%

Collective excitations of a spherically confined Yukawa plasma

Kählert

Bönitz

2011

Phys. Rev. E

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The results of a recent fluid theory for the multipole modes of a Yukawa plasma in a spherical confinement [H. Kählert and M. Bonitz, Phys. Rev. E 82, 036407 (2010)] are compared with molecular dynamics simulations and the exact N -particle eigenmodes in the crystalline phase. Simulations confirm the existence of high order modes found in cold fluid theory. We investigate the influence of screening, coupling and friction on the mode spectra in detail. Good agreement between theory and simulation is found for weak to moderate screening and low order modes. The relations between the breathing mode in the fluid theory, simulation and the crystal eigenmode are investigated in further detail.

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“…6 Increasing the screening is found to increase the population of the inner shells of small three dimensional strongly coupled clusters. 7 Not only ground state configurations are affected by screening interaction between particles, but also metastable states. Experiments show the probability to observe a certain metastable configuration depends on the interaction range.…”

Section: Introductionmentioning

confidence: 99%

Modeling the interaction between two dimensional strongly coupled confined dust clusters

2010

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Numerical simulations based on the Monte Carlo method are conducted to investigate ground-state configurations and phase transitions of strongly coupled dust particles. The interaction between negatively charged dust particles is modeled by three different potentials, namely, Coulomb, Yukawa, and logarithmic. The effect of random charge fluctuation is taken into account for a dominant charging process by particles collection and in the presence of two dimensional parabolic confinement potential. Structural arrangement and phase transition are found to be dependent on the potential interaction and the charge fluctuation. The changes in the melting temperature, when the charge fluctuation is taken into account, are particularly noticeable for systems with particles interacting through logarithmic potential.

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Ground states of finite spherical Yukawa crystals

Cited by 24 publications

References 40 publications

Probability of metastable configurations in spherical three-dimensional Yukawa crystals

Probability of metastable configurations in spherical three-dimensional Yukawa crystals

Collective excitations of a spherically confined Yukawa plasma

Modeling the interaction between two dimensional strongly coupled confined dust clusters

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