Bond orientational order parameters in the crystalline phases of the classical Yukawa-Wigner bilayersM. Mazars
Laboratoire de Physique Théorique (UMR 8627), Université de Paris Sud XI Bâtiment 210, 91405 Orsay Cedex, France, EU
received 25 September 2008; accepted in final form 24 October 2008; published December 2008
published online 12 December 2008
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 quasitwo-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.
52.27.Lw - Dusty or complex plasmas; plasma crystals.
82.70.Dd - Colloids.
64.70.K- - Solid-solid transitions.
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