1. Unité de Physico-Chimie et de Physique des Matériaux (P.C.P.M.), Université Catholique de Louvain (UCL), Place Croix du Sud, 1 Boltzmann, B-1348 Louvain-la-Neuve, Belgium, Laboratoire de Physique des Solides, Université Paris Sud, Building 510, 91405 Orsay, France, INFM-DEMOCRITOS National Simulation Center and Center of Excellence for Nanostructured Materials (CENMAT), University of Trieste, Italy, Physics Department, King's College London, Strand, London WC2R 2LS, United Kingdom, and Research Center in...