Over the last 6 years, I have theoretically studied hybrid systems composed of both matter and antimatter:

• The first topic is as a part of the GBAR (Gravitational Behavior of Antihydrogen at Rest) experiment at CERN. The latter aimed to calculate antihydrogen ($\bar{\text{H}}$) production cross sections by assisting the two reactions involved in this experiment by a laser field, in order to increase the production rates. The semi-perturbative approaches considered here, based on the first Born approximation (FBA), combine Volkov states and Coulomb Green's functions to respectively dress the ejected electron and deal with the interaction between the laser field and the positronium (Ps) target in the entrance channel.
• In the second topic, I focused on the production of positronium chloride (PsCl) to support and design new attosecond experiments using hybrid systems. A mean-field method to take account of the electronic structure of PsCl was implemented in the collision code, and the structure input data associated with it were obtained using ab-initio methods (i.e. by performing the RHF, CISD and LCCSD wavefunctions). For this purpose, the versatile open-source Quantum Package (QP) programming environment widely used in quantum chemistry was employed.

Under the supervision of Valérie Véniard, I have more recently turned my attention at LSI to the simulation of pump-probe experiments with Al$_2$O$_3$, using the so-called Octopus TDDFT code. This experiments will be developed in LIDYL at Saclay in collaboration with the team of Stéphane Guizard.