Prix de thèse de l'Ecole Polytechnique au LSI
Le 21 juin 2013 à 14h, Matteo Guzzo recevra le prix de thèse de l’École polytechnique. Il compte parmi les 13 attributaires de l'année 2013.
Matteo a soutenu sa thèse en octobre 2012, sous la direction de Francesco Sottile du groupe de Spectroscopie Théorique du LSI (laboratoire des solides irradiés). Elle avait pour sujet : "Dynamical correlation in solids: a perspective in photoelectron spectroscopy".
"My thesis presents theoretical, numerical and experimental results for photoemission spectroscopy in semiconductors. The key quantity for the theory of photoemission is the one-particle Green's function. The GW approximation is a state-of-the-art method to describe the Green's function and in particular band structures, while the description of thesatellites is often bad.
I have focused my work on the development of new theoretical methods that go beyond the GW approximation. These developments are based on two theoretical frameworks: time-dependent density-functional theory (TDDFT)and Green's function theory (GFT). TDDFT was used to explore the effect of two-point vertex corrections on quasiparticle energies. GFT was applied to plasmon satellites in valence-band photoemission spectra of semiconductors.
Numerical simulations have been carried out on bulk silicon, SiC, graphite and graphene, and coupled with XPS experiments at the SOLEIL synchrotron facility (TEMPO beamline).
Focusing on the comparison between theory and experiment, I determined the effects that have to be included in the intrinsic spectral function in order to obtain a realistic description. The resulting agreement with experiment in silicon and graphite is excellent. My results give a clear interpretation of the photoemission peaks. In particular, the excitation of plasmons is crucial in the systems considered here. These results have shed light on the flaws of the GW approximation in this respect. This opens the way to applications in more complex systems, such as oxides."
La remise des prix aura lieu le 21 juin 2013.
Lieu : Amphi Arago