Structure, normal mode spectra, and mixing of a binary system of charged particles confined in a parabolic trap

Ferreira, W. P.; Munarin, F. F.; Nelissen, K.; Filho, R. N. Costa; Peeters, F. M.; Farias, G. A.

doi:10.1103/physreve.72.021406

Cited by 28 publications

(38 citation statements)

References 19 publications

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“…The annealing time is 6 × 10 4 ω −1 0 , and the integration time step is 0.003ω −1 0 . We have checked the accuracy of our simulations by comparing our results to the stable-state configurations of single-or two-species clusters obtained from Monte Carlo (MC) or MD simulations [20,21,32,34]. We found very good agreement between our results and those obtained from these MC and MD simulations.…”

Section: Model System and Numerical Approachsupporting

confidence: 51%

“…The studies have found that in an isotropic (circular) confinement potential, the particles of different species segregate into different shells, with the particles of the largest (smallest) mass-to-charge ratio tending to populate near to (far away from) the system center [35]. The different particles also become mixed together if they have the same mass-to-charge ratio, although their individual masses and charges [34,35] are different. The investigation performed so far on 2D multi-species systems has been restricted to confinement in an isotropic potential.…”

Section: Introductionmentioning

confidence: 99%

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Particles separation in anisotropically confined two-dimensional multi-species systems

Liu¹,

Chew²

2007

J. Phys.: Condens. Matter

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Self-organized separation of multi-species charged particles in anisotropically confined two-dimensional systems is studied by means of molecular dynamics simulation. The multi-species particles of different mass and charge, interacting through a Coulomb potential, are confined by external potentials of different shapes, such as the circular, elliptical, triangular and square shaped potentials. It is found that the different particles segregate into different shells, with the particles having the largest (smallest) mass-to-charge ratio located nearest to (furthest away from) the system center. When the different particles possess the same mass-to-charge ratio, they become mixed together, despite having different mass and charge. This general rule is independent of the total number of particles, the number of species and the symmetries of the different confinement potentials. When these potentials rotate at a sufficiently high frequency around their origins, the anisotropy of the system configuration can be destroyed, and the whole system configuration becomes circular in shape, while the general rule of particle separation remains valid.

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Section: Model System and Numerical Approachsupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Particles separation in anisotropically confined two-dimensional multi-species systems

Liu¹,

Chew²

2007

J. Phys.: Condens. Matter

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“…the curious ground state configuration found in a 3D finite size binary Coulomb cluster 5 , where a mixed arrangement of the two types of particles was observed in the core, while the edge of the system was characterized by shell structures of separated species. Similarly, in 2D systems we can cite a reentrant melting phenomenon in a 2D circular confined cluster of repulsive dipoles 6,7 , and interesting asymmetrical ground state configurations observed in symmetrically confined Coulomb clusters 8,9 .…”

Section: Introductionmentioning

confidence: 63%

“…We only considered equal mass particles. If masses are taken different the two types of particles will feel a different confinement potential which will result in a quantitative modification of the phase diagram 8 .…”

Section: Ground State Crystal Structuresmentioning

confidence: 99%

Structural and dynamical properties of a quasi-one-dimensional classical binary system

et al. 2008

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The ground state configurations and the ''normal'' mode spectra of a quasi-one-dimensional (Q1D) binary system of charged particles interacting through a screened Coulomb potential are presented. The minimum energy configurations were obtained analytically and independently through molecular dynamic simulations. A rich variety of ordered structures were found as a function of the screening parameter, the particle density, and the ratio between the charges of the distinct types of particles. Continuous and discontinuous structural transitions, as well as an unexpected symmetry breaking in the charge distribution are observed when the density of the system is changed. For near equal charges we found a disordered phase where a mixing of the two types of particles occurs. The phonon dispersion curves were calculated within the harmonic approximation for the one-and two-chain structures.

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“…Many numerical studies have been performed to investigate the crystallization and melting in the above systems by simulating a model system of charged classical pointlike particles, i.e. a Wigner-type crystal [14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Influence of an ellipsoid on the angular order in a two-dimensional cluster

2011

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The influence of an ellipsoid on the angular order of two-dimensional classical clusters is investigated through Brownian dynamics simulations. We found the following: (1) The presence of an ellipsoid does not influence the start of the angular melting, but reduces the rate at which the inner rings can rotate with respect to each other. (2) Even a small eccentricity of the ellipsoid leads to a stabilization of the angular order of the system. (3) Depending on the position of the ellipsoid in the cluster, a reentrant behavior in the angular order is observed before full radial melting of the cluster sets in. (4) The ellipsoid can lead to a two-step angular melting process: First, the rotation of the inner rings with respect to each other is hindered by the ellipsoid, but on further increasing the kinetic energy of the system, the ellipsoid just starts to behave as a spherical particle with different mobility. The effect of an ellipsoid on the molten system does not depend crucially on the interparticle interaction, but a softer parabolic confinement reduces the angular stabilization.

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Structure, normal mode spectra, and mixing of a binary system of charged particles confined in a parabolic trap

Cited by 28 publications

References 19 publications

Particles separation in anisotropically confined two-dimensional multi-species systems

Particles separation in anisotropically confined two-dimensional multi-species systems

Structural and dynamical properties of a quasi-one-dimensional classical binary system

Influence of an ellipsoid on the angular order in a two-dimensional cluster

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