Realization of a strongly interacting Bose-Fermi mixture from a two-component Fermi gas

Details Realization of a strongly interacting Bose-Fermi mixture from a two-component Fermi gas Realization of a strongly interacting Bose-Fermi mixture from a two-component Fermi gas

2008-05-06

arxiv.org/abs/0805.0623v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.101.070404

We show the emergence of a strongly interacting Bose-Fermi mixture from a two-component Fermi mixture with population imbalance. By analyzing in situ density profiles of $^6$Li atoms in the BCS-BEC crossover regime we identify a critical interaction strength, beyond which all minority atoms pair up with majority atoms, and form a Bose condensate. This is the regime where the system can be effectively described as a boson-fermion mixture. We determine the dimer-fermion and dimer-dimer scattering lengths and beyond-mean-field contributions. Our study realizes a Gedanken experiment of bosons immersed in a Fermi sea of one of their constituents, revealing the composite nature of the bosons.

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