Propagation d'atomes ultra-froids en milieu désordonné - Étude dans l'espace des impulsions de phénomènes de diffusion et de localisation

Jérémie Richard 1
1 Laboratoire Charles Fabry / Optique atomique
LCF - Laboratoire Charles Fabry
Abstract : The work presented in this thesis is linked to the observation in momentum space of diffusion and localization phenomena using matter waves in optical disorder. We start by a general introduction on disorder physics and propagation in complex media by describing diffusion and localization phenomena such as the coherent backscattering or the Anderson localization. Then, we develop the experimental aspect of our work which is related to ultra-cold atoms, manipulated and controlled in order to create a coherent matter-wave analogous to a plane wave. Optics is an essential aspect of our work, that is why we present a complete experimental study of the system of creation of our disorder, called speckle field. These preliminary steps allow us to describe the research done by our team. An elementary parameter of diffusion, the elastic scattering time has been experimentally measured for an attractive and a repulsive speckle field. A weak localization phenomenon visible in momentum space, the coherent backscattering, observed for the first time with ultra-cold atoms, is then presented. The consequent study of the resurgence of coherent backscattering, done by our team, is based on the manipulation of an essential property for coherent propagation in disorder: the time reversal symmetry. Finally, we present a preliminary study of a novel signature in momentum space of the Anderson localization called coherent forward-scattering.
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Jérémie Richard. Propagation d'atomes ultra-froids en milieu désordonné - Étude dans l'espace des impulsions de phénomènes de diffusion et de localisation. Optique [physics.optics]. Université Paris-Saclay, 2015. Français. ⟨NNT : 2015SACLO001⟩. ⟨tel-01246561⟩

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