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Transport quantique d'atomes ultra-froids en milieu désordonné : Temps de diffusion élastique et fonctions spectrales

Baptiste Lecoutre 1
1 Laboratoire Charles Fabry / Gaz Quantiques
LCF - Laboratoire Charles Fabry
Abstract : This manuscript presents the work of a thesis dealing with the quantum transport of matter-waves in optical disordered potentials. This thesis lies in the context of the experimental study of the critical regime of the Anderson transition separating the localized states of a quantum particle in a disordered potential from its diffusive states. We will first present the fundamental concepts of wave propagation in disordered media to introduce the phenomenon of Anderson localization, for which we will establish the state of the art of its study with ultracold atoms. We will then present our apparatus, generating Bose-Einstein condensates as sources of matter-waves as well as our setup generating a spin-dependant optical disorder. We will focus on the upgrades we brought to our experiment to overcome the limitations previously encountered. After the introduction of these concepts, we will focus on the measurement of the elastic scattering time which is one the elmentary parameters of wave propagation in disorder. We will finish by connecting those measurements to the concept of spectral function, previously measured with our experiment. All those works pave the way to the spectrocopic study of the Anderson transition with ultracold atoms.
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Baptiste Lecoutre. Transport quantique d'atomes ultra-froids en milieu désordonné : Temps de diffusion élastique et fonctions spectrales. Optique [physics.optics]. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASP060⟩. ⟨tel-03141534⟩

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