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Designing and building an ultracold Dysprosium experiment : a new framework for light-spin interaction

Abstract : In this thesis I present the construction of a new experiment producing ultra cold gases of Dysprosium. Using the favourable electronic structure of open-shell lanthanide atoms, we aim at the realisation of laser-induced synthetic gauge fields, which could lead to the observation of novel (topological) phases of matter. The coupling of the atomic spin with the light field, improved with respect to alkali atoms, opens the possibility to explore strongly interacting regimes that were up to now out of experimental reach. I adapt existing protocols for the implementation of gauge fields to the case of Dysprosium, taking into account its large electronic spin (J = 8 in the ground state). Moreover, Dysprosium has the largest magnetic moment among the stable elements, and is the best candidate for the study of dipolar gases. I describe the experimental setup that we built and how we perform the trapping and cooling of Dysprosium. We study in detail the behaviour of the magneto-optical trap, which is performed on the ¹S₀ ↔ ³P₁ intercombination line. The narrow linewidth and the large spin make the trap operation quite challenging. Nevertheless, I show that its understanding becomes quite simple in the regime where the cloud spontaneously polarises due to the interplay of optical and gravitational forces. Finally, I describe the last steps of optical transport and evaporation, which will lead to the production of a degenerate gas.
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Submitted on : Tuesday, June 5, 2018 - 12:20:06 PM
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  • HAL Id : tel-01571420, version 2

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Davide Dreon. Designing and building an ultracold Dysprosium experiment : a new framework for light-spin interaction. Physics [physics]. Université Paris sciences et lettres, 2017. English. ⟨NNT : 2017PSLEE036⟩. ⟨tel-01571420v2⟩

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