Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-06-09
Phys. Rev B, 77, 014112 (2008)
Physics
Condensed Matter
Soft Condensed Matter
11 pages, 11 figs
Scientific paper
10.1103/PhysRevB.77.014112
The ground state configurations and the \lq{}\lq{}normal\rq{}\rq{} 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.
Carvalho J. C. N.
Farias G. A.
Ferreira W. P.
Oliveira P. W. S.
Peeters François M.
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