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Superfluidity in an ultracold mixture of lithium bose-fermi gases

Objetivo

Bose-Einstein condensation (BEC) is at the basis of several phenomena in physics: super fluidity and superconductivity are believed to be manifestations of BEC. While BEC's have been successfully created in ultra-cold atomic gases since 1995, its counterpart of a super fluid Fermi gas (BCS) still remains to be realized. The achievement of a Fermi super fluid in an ultra cold gas is considered as the next major breakthrough in atomic physics. The lithium experiment at ENS has the ability to combine these types of super fluids, because it utilizes a mixture of both fermionic and bosonic isotopes. For the creation of a super fluid Fermi gas the properties of two-body interactions are much more critical then fora BEC, and regular interaction strengths give a critical temperature estimate far out of range in current experiments. However, scattering properties can be manipulated with magnetic fields and give rise to a strong coupling mechanism. We will investigate the incorporation of these microscopic resonant interactions into the many-body descriptions of these quantum gases, and work in close collaboration with the experimentalists on difficulties along the road to BCS. The goal is to find a way to experimentally realize a super fluid Fermi gas , and to do new experiments which involve the coherences of both BEC and BCS sysems, and shed light on the connection between these two regimes. A field of study will be the formation of cold molecules out of these two types of quantum fluids .At ENS, I will largely benefit from the presence of the lithium Bose- Fermi mixtures experiment of prof. Salomon, and the ability to interact with all the experimentalists in this group. My theoretical supervisor prof. Shlyapnikov is well known in atomic physics and has many contributions in the field of ultra-cold many-body quantum systems. Moreover, the physics department of ENS is largely devoted to cold atomic physics, and the interaction with other people at the institute, both face to face and in group meetings, will be very stimulating for the research. The institute ENS will benefit from my background in cold collision physics, which was my field of research during my doctoral period. It will also benefit from my work and knowledge as a post-doc at JILA in BCS experiments and worked on the theory of resonant many-body systems.

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Coordinador

ECOLE NORMALE SUPERIEURE
Aportación de la UE
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Dirección
Rue Lhomond 24
75231 PARIS
Francia

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