title: Dielectric matrix and plasmon dispersion in strongly coupled electronic bilayer liquids.
abstract: We develop a dielectric matrix and analyze plasmon dispersion in strongly coupled charged-particle bilayers in the T = 0 quantum domain. The formulation is based on the classical quasilocalized charge approximation (QLCA) and extends the QLCA formalism into the quantum domain. Its development, which parallels that of the two-dimensional companion paper [Phys. Rev. E 70, 026406 (2004)] by three of the authors, generalizes the single-layer scalar formalism therein to a bilayer matrix formalism. Using pair correlation function data generated from diffusion Monte Carlo simulations, we calculate the dispersion of the in-phase and out-of-phase plasmon modes over a wide range of high- r(s) values and layer separations. The out-of-phase spectrum exhibits an exchange-correlation induced long-wavelength energy gap in contrast to earlier predictions of acoustic dispersion softened by exchange and correlations. The energy gap is similar to what has been previously predicted for classical charged-particle bilayers and subsequently confirmed by recent molecular dynamics computer simulations.
authors.affiliation: Department of Mathematics and Statistics, University of Vermont, Burlington, 05405, USA. senatore@ts.infn.it
authors.forename: Kenneth I
authors.initials: KI
authors.lastname: Golden
authors.forename: Hania
authors.initials: H
authors.lastname: Mahassen
authors.forename: Gabor J
authors.initials: GJ
authors.lastname: Kalman
authors.forename: Gaetano
authors.initials: G
authors.lastname: Senatore
authors.forename: F
authors.initials: F
authors.lastname: Rapisarda