Nonlinear screening in large two-dimensional Coulomb clusters

Kong, Minghui; Vagov, A; Partoens, B; Peeters, F M; Ferreira, W P; Farias, G A

doi:10.1103/PhysRevE.70.051807

Title: Nonlinear screening in large two-dimensional Coulomb clusters

Full Record
Other Related Research

Abstract

The distortion due to a fixed point impurity with variable charge placed in the center of a classical harmonically confined two-dimensional (2D) large Coulomb cluster is studied. We find that the net topological charge (N{sub -}-N{sub +}) of the system is always equal to six independent of the position and charge of the impurity. In comparison with a 2D cluster without impurity charge, only the breathing mode remains unchanged. The screening length is found to be a highly nonlinear function of the impurity charge. For values of the impurity charge smaller than the charge of the other particles, the system has almost the same screening strength. When the impurity charge is larger, the screening length is strongly enhanced. This result can be explained by the competition between the different forces active in the system.

Authors:

Kong, Minghui; Vagov, A; Partoens, B; Peeters, F M; Ferreira, W P; Farias, G A ^[1]

Departement Fysica, Universiteit Antwerpen (Campus Drie Eiken), Universiteitsplein 1, B-2610 Antwerpen (Belgium)

Publication Date:: Mon Nov 01 00:00:00 EST 2004

OSTI Identifier:: 20636855

Resource Type:: Journal Article

Journal Name:: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

Additional Journal Information:: Journal Volume: 70; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevE.70.051807; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-651X

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS; COMPARATIVE EVALUATIONS; CRYSTALS; IMPURITIES; NONLINEAR PROBLEMS; PARTICLES; SCREENING; TOPOLOGY; TWO-DIMENSIONAL CALCULATIONS

Citation Formats


                    Kong, Minghui, Vagov, A, Partoens, B, Peeters, F M, Ferreira, W P, Farias, G A, and Departamento de Fisica, Universidade Federal do Ceara, Caixa Postal 6030, Campus do Pici, 60455-760 Fortaleza, Ceara. Nonlinear screening in large two-dimensional Coulomb clusters.  United States: N. p., 2004. 
        Web.  doi:10.1103/PhysRevE.70.051807.

Copy to clipboard


                    Kong, Minghui, Vagov, A, Partoens, B, Peeters, F M, Ferreira, W P, Farias, G A, & Departamento de Fisica, Universidade Federal do Ceara, Caixa Postal 6030, Campus do Pici, 60455-760 Fortaleza, Ceara. Nonlinear screening in large two-dimensional Coulomb clusters.  United States.  https://doi.org/10.1103/PhysRevE.70.051807

Copy to clipboard


                    Kong, Minghui, Vagov, A, Partoens, B, Peeters, F M, Ferreira, W P, Farias, G A, and Departamento de Fisica, Universidade Federal do Ceara, Caixa Postal 6030, Campus do Pici, 60455-760 Fortaleza, Ceara. 2004.  
        "Nonlinear screening in large two-dimensional Coulomb clusters".  United States.  https://doi.org/10.1103/PhysRevE.70.051807.

Copy to clipboard


                    
@article{osti_20636855,

  title        = {Nonlinear screening in large two-dimensional Coulomb clusters},

  author       = {Kong, Minghui and Vagov, A and Partoens, B and Peeters, F M and Ferreira, W P and Farias, G A and Departamento de Fisica, Universidade Federal do Ceara, Caixa Postal 6030, Campus do Pici, 60455-760 Fortaleza, Ceara},

  abstractNote = {The distortion due to a fixed point impurity with variable charge placed in the center of a classical harmonically confined two-dimensional (2D) large Coulomb cluster is studied. We find that the net topological charge (N{sub -}-N{sub +}) of the system is always equal to six independent of the position and charge of the impurity. In comparison with a 2D cluster without impurity charge, only the breathing mode remains unchanged. The screening length is found to be a highly nonlinear function of the impurity charge. For values of the impurity charge smaller than the charge of the other particles, the system has almost the same screening strength. When the impurity charge is larger, the screening length is strongly enhanced. This result can be explained by the competition between the different forces active in the system.},

  doi          = {10.1103/PhysRevE.70.051807},

  url          = {https://www.osti.gov/biblio/20636855},
  journal      = {Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics},

  issn         = {1063-651X},

  number       = 5,

  volume       = 70,

  place        = {United States},

  year         = {Mon Nov 01 00:00:00 EST 2004},

  month        = {Mon Nov 01 00:00:00 EST 2004}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1103/PhysRevE.70.051807

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Study of two-dimensional Debye clusters using Brownian motion

Journal Article Sheridan, T; Theisen, W - Physics of Plasmas

A two-dimensional Debye cluster is a system of n identical particles confined in a parabolic well and interacting through a screened Coulomb (i.e., a Debye-Hueckel or Yukawa) potential with a Debye length {lambda}. Experiments were performed for 27 clusters with n=3-63 particles (9 {mu}m diam) in a capacitively coupled 9 W rf discharge at a neutral argon pressure of 13.6 mTorr. In the strong-coupling regime each particle exhibits small amplitude Brownian motion about its equilibrium position. These motions were projected onto the center-of-mass and breathing modes and Fourier analyzed to give resonance curves from which the mode frequencies, amplitudes, andmore »« less
https://doi.org/10.1063/1.2215475
A possible pairing mechanism for HTSC: Two-dimensional confinement and Coulomb over-screening

Journal Article Ariosa, D; Beck, H - International Journal of Modern Physics B

Among all the common properties of HTCS cuprates, the authors build their model on two of them: their high anisotropy, and their extremely low density of charge carriers. The intralayer pairing mechanism is provided by the two-dimensional over-screening of Coulomb repulsion. The c-axis zero point energy restricts this pairing to a low carrier density region. Below a critical density, the system behaves as a two-dimensional confined jellium where the energy gain due to charge pairing is larger than the c-axis localization energy. In the high density region, where the pairing energy cannot compensate the localization energy, the system delocalizes andmore »« less
https://doi.org/10.1142/S0217979299003234
Plasma-screening effects on bremsstrahlung in electron{endash}ion Coulomb scatterings in strongly coupled plasmas

Journal Article Jung, Y - Physics of Plasmas

Plasma-screening effects are investigated for the bremsstrahlung in electron{endash}ion Coulomb scatterings in strongly coupled plasmas using the classical trajectory method. In strongly coupled plasmas, the electron{endash}ion interaction potential is obtained by the ion-sphere model potential. The classical straight-line trajectory approximation is applied to the motion of the projectile electron in order to investigate the variation of the differential bremsstrahlung radiation cross section as a function of the impact parameter and ion-sphere radius. The results show that the plasma-screening effects for the differential bremsstrahlung radiation cross section are increased with increasing the ion-sphere radius. The differential bremsstrahlung radiation cross sections aremore »« less
https://doi.org/10.1063/1.871692
Transport properties of quasi-two-dimensional dissipative systems with a screened Coulomb potential

Journal Article Vaulina, O; Dranzhevskii, I - Plasma Physics Reports

Results are presented from numerical investigations of the dynamics of quasi-two-dimensional systems in the form of a monolayer of dust grains interacting by means of a screened Coulomb potential and suspended in the Earth's gravitational field by an external electric field. The structural and transport characteristics of such a system, including the pair correlation functions and the viscosity and diffusion coefficients, were investigated over a broad parameter range corresponding to the conditions under which dust structures are observed in RF capacitive discharge plasmas. An analysis of the results obtained revealed that there is a specific topological transition typical of systemsmore » having a low spatial dimension.« less
https://doi.org/10.1134/S1063780X07060062
Molecular dynamics study of a two-dimensional system with screened Coulomb interactions

Journal Article Cheng, H; Dutta, P; Ellis, D; ... - J. Chem. Phys.; (United States)

We have used molecular dynamics to study a two-dimensional system of point particles with screened Coulomb interactions, in a ''box'' whose size is allowed to vary. In addition to determining the familiar energy--temperature relations at both constant area and constant pressure, we have obtained pressure--area isotherms, diffusion constants, and pair-correlation functions. The results of our simulation are expected to be relevant to such systems as polar monolayers on the surface of water (Langmuir films) and thin colloidal suspensions. By monitoring the energy--temperature relation and the diffusion constant, we have observed first order solid--liquid transitions with hysteresis under both constant areamore »« less
https://doi.org/10.1063/1.451118

Similar Records