Nonlinear response of electrons to a positive ion

Details Nonlinear response of electrons to a positive ion Nonlinear response of electrons to a positive ion

2002-10-31

arxiv.org/abs/cond-mat/0210713v1

Physics

Condensed Matter

Statistical Mechanics

To be published in the proceedings of the International Workshop on Strongly Coupled Coulomb Systems, Journal of Physics A

Scientific paper

10.1088/0305-4470/36/22/330

Electric field dynamics at a positive ion imbedded in an electron gas is considered using a semiclassical description. The dependence of the field autocorrelation function on charge number is studied for strong ion-electron coupling via MD simulation. The qualitative features for larger charge numbers are a decreasing correlation time followed by an increasing anticorrelation. Stopping power and related transport coefficients determined by the time integral of this correlation function result from the competing effects of increasing initial correlations and decreasing dynamical correlations. An interpretation of the MD results is obtained from an effective single particle model showing good agreement with the simulation results.

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