The candidate will have to implement methods to accelerate the obtaining of atom trajectories. To do this, he/she will have to demonstrate creativity and physical sense. The trajectories will be calculated using the ABINIT software (www.abinit.org), an open-source program developed as part of an international collaboration, in which our laboratory is one of the main players. The ABINIT code is perfectly suited for use on the CEA supercomputers to which the candidate will have access during the internship. If the study requires it, it may be useful to develop digital tools. In accordance with the commitments made by the CEA in favor of the integration of people with disabilities, this job is open to everyone. Participating in national protection, an administrative investigation is carried out for all CEA employees in order to ensure the integrity and security of the nation.