Etude miscroscopique de la distibution en impulsion de condensats de Bose-Eintein d'Hélium métastable

Quentin Bouton 1
1 Laboratoire Charles Fabry / Optique atomique
LCF - Laboratoire Charles Fabry
Abstract : In this thesis, we report the first observation of the particles associated with the quantum depletion and the first measurements of the momentum distribution of correlated superfluid lattice bosons. We performed the experiment with a degenerate metastable Helium gas with a novel experimental setup. Making possible with metastable Helium, our electronic detection allows single-atom detection in momentum space k.Firsly, we have demonstrated a new approach to Bose-Einstein condensation of metastable Helium using a hybrid trap, consisting of a magnetic quadrupole and a crossed optical dipole trap. It results in production of a condensate every 6 seconds. Then we observed the excited particles out of the condensate wavefunction due to presence of the interactions (quantum depletion). We observe atom distributions decaying at large momenta k with the 1/k4 power-law predicted by Bogoliubov theory. Furthermore we studied the three-dimensional far field distribution of correlated superfluid lattice bosons. The momentum distributions of the trapped atoms calculated with an ab-initio Monte-Carlo Worm algorithm for the experimental parameters are in excellent agreement with the measured distributions. The finite temperature effect is not negligible, paving the way for a precise thermometry.
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Quentin Bouton. Etude miscroscopique de la distibution en impulsion de condensats de Bose-Eintein d'Hélium métastable. Optique [physics.optics]. Université Paris-Saclay, 2016. Français. ⟨NNT : 2016SACLO010⟩. ⟨tel-01403320⟩

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