title: Dimeric and dipolar ground state orders in colloidal molecular crystals.
abstract: A two-dimensional colloidal suspension subject to a periodic substrate evolves into a colloidal molecular crystal under situations of strong confinement. We focus on the long-range orientational order thereby emerging, in the ground state. We study by simulations the situations where in each trap lies a pair of identical colloids, or alternatively a pair of oppositely charged macroions. We consider square or triangular geometries for the periodic confinement, together with less symmetric distorted lattices.
authors.affiliation: Laboratoire de Physique Théorique et Modèles Statistiques(CNRS UMR 8626), Université Paris-Sud, Orsay Cedex, France. trizac@lptms.u-psud.fr
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Trizac
authors.forename: Samir
authors.initials: S
authors.lastname: El Shawish
authors.forename: Jure
authors.initials: J
authors.lastname: Dobnikar