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Réalisation d'un condesat de Bose-Einstein sur une microstructure

Christine Aussibal 1
1 laboratoire Charles Fabry de l'Institut d'Optique / Optique atomique
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : The experiment described in this report is a part of the evolution in research in atomic physics towards the development of miniaturised devices to generate and manipulate coherent matter waves. This thesis presents the realisation of a Bose-Einstein condensate of a dilute gas of 87Rb atoms in a magnetic trap generated by a microfabricated structure, called atom chip. In our case, the chip is made of gold wires deposited on a silicon substrate by optical lithography and electroplating. This report decribes this experiment in its entirety, from initial motivations to the technical choices to the experimental results. Experimentally, a macroscopic magneto-optical trap is first loaded with atoms from a rubidium thermal source (dispenser), the magnetic field of this trap being generated by macroscopic coils located outside the vacuum chamber. Atoms are then transferred to a magneto-optical trap close to the surface of the atom chip, whose quadrupolar magnetic field is produced by the current circulating in a U-shaped microfabricated wire. Finally, atoms are trapped in a Ioffe-Pritchard type magnetic trap created by the current circulating in a Z-shaped wire on the same chip. The temperature of the magnetically trapped atomic is decreased by rf-evaporative cooling to reach Bose-Einstein condensation. When the height of the atomic cloud above the surface of the chip decreases, the cloud fragments into several pieces. This phenomenum corresponds to a potential roughness due to an inhomogeneïty of the current density in the Z-shaped wire.
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Submitted on : Friday, January 30, 2004 - 4:19:40 PM
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  • HAL Id : tel-00004429, version 1

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Christine Aussibal. Réalisation d'un condesat de Bose-Einstein sur une microstructure. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2003. Français. ⟨tel-00004429⟩

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