
The Theoretical Spectroscopy Group at the Laboratoire des Solides Irradiés (LSI) conducts basic research in Condensed Matter Theoretical Physics from both an ab initio and an empirical point of view. Areas of interest are Density-Functional Theory (DFT), Time-Dependent Density-Functional Theory (TDDFT) and Many-Body Perturbation Theory (MBPT). The global aim is to develop the Theory, the Algorithms and the Codes for applications to real systems and comparison with the experiments. Both ground-state and excited states (spectroscopies) are studied. The systems range from bulk to surfaces, nanostructures, molecules and atoms; from metals to insulators.