### Abstract

We have analysed the dispersion of longitudinal collective modes in classical asymmetric charged-particle bilayer liquids in the strong coupling regime. The theoretical analysis is based on a dielectric matrix calculated in the quasi-localized charge approximation (QLCA). The matrix elements are expressed as integrals over inter-layer and intra-layer pair correlation function data that we have generated by molecular dynamics (MD) simulations. At the same time, MD simulations of density and current fluctuation spectra were analysed to infer the collective mode dispersion. The long-wavelength finite frequency (energy) gap, brought about by strong inter-layer correlations, is a monotonically increasing function of the density ratio, n_{2}/n _{1}, and, for the smallest value of the inter-layer spacing considered, the gap reaches its maximum value when the two layer densities are equal. It appears that it stays at that value for n_{2}/n_{1} > 1.

Original language | English |
---|---|

Pages (from-to) | 4601-4605 |

Number of pages | 5 |

Journal | Journal of Physics A: Mathematical and General |

Volume | 39 |

Issue number | 17 |

DOIs | |

Publication status | Published - Apr 28 2006 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)
- Statistical and Nonlinear Physics
- Mathematical Physics

### Cite this

*Journal of Physics A: Mathematical and General*,

*39*(17), 4601-4605. https://doi.org/10.1088/0305-4470/39/17/S45

**Longitudinal collective modes in asymmetric charged-particle bilayers.** / Mahassen, Hania; Kutasi, K.; Golden, Kenneth I.; Kalman, Gabor J.; Donkó, Z.

Research output: Contribution to journal › Article

*Journal of Physics A: Mathematical and General*, vol. 39, no. 17, pp. 4601-4605. https://doi.org/10.1088/0305-4470/39/17/S45

}

TY - JOUR

T1 - Longitudinal collective modes in asymmetric charged-particle bilayers

AU - Mahassen, Hania

AU - Kutasi, K.

AU - Golden, Kenneth I.

AU - Kalman, Gabor J.

AU - Donkó, Z.

PY - 2006/4/28

Y1 - 2006/4/28

N2 - We have analysed the dispersion of longitudinal collective modes in classical asymmetric charged-particle bilayer liquids in the strong coupling regime. The theoretical analysis is based on a dielectric matrix calculated in the quasi-localized charge approximation (QLCA). The matrix elements are expressed as integrals over inter-layer and intra-layer pair correlation function data that we have generated by molecular dynamics (MD) simulations. At the same time, MD simulations of density and current fluctuation spectra were analysed to infer the collective mode dispersion. The long-wavelength finite frequency (energy) gap, brought about by strong inter-layer correlations, is a monotonically increasing function of the density ratio, n2/n 1, and, for the smallest value of the inter-layer spacing considered, the gap reaches its maximum value when the two layer densities are equal. It appears that it stays at that value for n2/n1 > 1.

AB - We have analysed the dispersion of longitudinal collective modes in classical asymmetric charged-particle bilayer liquids in the strong coupling regime. The theoretical analysis is based on a dielectric matrix calculated in the quasi-localized charge approximation (QLCA). The matrix elements are expressed as integrals over inter-layer and intra-layer pair correlation function data that we have generated by molecular dynamics (MD) simulations. At the same time, MD simulations of density and current fluctuation spectra were analysed to infer the collective mode dispersion. The long-wavelength finite frequency (energy) gap, brought about by strong inter-layer correlations, is a monotonically increasing function of the density ratio, n2/n 1, and, for the smallest value of the inter-layer spacing considered, the gap reaches its maximum value when the two layer densities are equal. It appears that it stays at that value for n2/n1 > 1.

UR - http://www.scopus.com/inward/record.url?scp=33645715481&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33645715481&partnerID=8YFLogxK

U2 - 10.1088/0305-4470/39/17/S45

DO - 10.1088/0305-4470/39/17/S45

M3 - Article

AN - SCOPUS:33645715481

VL - 39

SP - 4601

EP - 4605

JO - Journal Physics D: Applied Physics

JF - Journal Physics D: Applied Physics

SN - 0022-3727

IS - 17

ER -