Several Marie Curie host fellowships are available at the Laboratoire des Solides Irradiés, Ecole Polytechnique, Palaiseau (Paris, France), in collaboration with Dr. Lucia Reining. The fellowships are for one year each, in the period 2002-2004. The research will be inserted in the framework of ongoing collaborations within the EU Research Training Network NANOPHASE (NANOscale PHoton Absorption and Spectroscopy with Electrons). The overall topic of the network research is theory of nanometer -scale structures and the spectroscopic processes that can be used to characterize those structures, their electronic and optical properties, and their growth. These are studied using fundamental theory and state-of-the-art abinitio computer simulations. (Please see also http://www-users.york.ac.uk/-rwg3/nanophase.html.) In particular, the group in Palaiseau has been working during the last years in the field of one- and two-particles Green' s functions calculations (GW, excitons). These topics should be developed further, concerning both theory and numerics, with applications to nanostructures and defects in oxides. Computer codes are already available. Computational facilities include locally IBM RS/6000 and Compaq DS-20 workstations, and national supercomputer time. Candidates should be working on a thesis subject close to these topics. He/she should have a strong background in theoretical condensed matter physics and like to perform both analytical and numerical work. If you are interested in this possibility, please don't hesitate to contact Lucia Reining.