title: Dynamical properties and melting of binary two-dimensional colloidal alloys.
abstract: A two-dimensional (2D) binary colloidal system consisting of interacting dipoles is investigated using an analytical approach. Within the harmonic approximation we obtain the phonon spectrum of the system as a function of the composition, dipole-moment ratio, and mass ratio between the small and big particles. Through a systematic analysis of the phonon spectra we are able to determine the stability region of the different lattice structures of the colloidal alloys. The gaps in the phonon frequency spectrum, the optical frequencies in the long-wavelength limit, and the sound velocity are discussed as well. Using the modified Lindemann criterion and within the harmonic approximation we estimate the melting temperature of the sublattice generated by the big particles.
authors.affiliation: Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, Campus do Pici, 60455-760 Fortaleza, Ceará, Brazil and Universidade Federal Rural do Semi-árido, Campus Pau dos Ferros, Pau dos Ferros, Rio Grande do Norte, Brazil.
authors.forename: I R O
authors.initials: IR
authors.lastname: Ramos
authors.affiliation: Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, Campus do Pici, 60455-760 Fortaleza, Ceará, Brazil.
authors.forename: W P
authors.initials: WP
authors.lastname: Ferreira
authors.affiliation: Centro de Tecnologia, Bloco 710, Universidade Federal do Ceará, Campus do Pici, 60455-760 Fortaleza, Ceará, Brazil.
authors.forename: F F
authors.initials: FF
authors.lastname: Munarin
authors.affiliation: Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, Campus do Pici, 60455-760 Fortaleza, Ceará, Brazil and Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
authors.forename: F M
authors.initials: FM
authors.lastname: Peeters