Issue
EPL
Volume 84, Number 5, December 2008
Article Number 55002
Number of page(s) 6
Section Physics of Gases, Plasmas and Electric Discharges
DOI http://dx.doi.org/10.1209/0295-5075/84/55002
Published online 12 December 2008
EPL, 84 (2008) 55002
DOI: 10.1209/0295-5075/84/55002

Bond orientational order parameters in the crystalline phases of the classical Yukawa-Wigner bilayers

M. Mazars

Laboratoire de Physique Théorique (UMR 8627), Université de Paris Sud XI Bâtiment 210, 91405 Orsay Cedex, France, EU

martial.mazars@th.u-psud.fr

received 25 September 2008; accepted in final form 24 October 2008; published December 2008
published online 12 December 2008

Abstract
We present a study of the structural properties of the crystalline phases for a planar bilayer of particles interacting via repulsive Yukawa potentials in the weak screening region. The study is done with Monte Carlo computations and the long-ranged contributions to energy are taken into account with the Ewald method for quasi$\hbox{--} $two-dimensional systems. Two first-order phase transitions (fluid-solid and solid-solid) and one second-order transition (solid-solid) are found when the surface density is varied at constant temperature. Particular attention is paid to the characteristics of the crystalline phases by the analysis of bond orientational order parameters and center-to-center correlations functions.

PACS
52.27.Lw - Dusty or complex plasmas; plasma crystals.
82.70.Dd - Colloids.
64.70.K- - Solid-solid transitions.

© EPLA 2008