Degenerate Fermi Gases of Ytterbium
Takeshi Fukuhara, Yosuke Takasu, Mitsutaka Kumakura, Yoshiro Takahashi
Abstract
An evaporative cooling was performed to cool the fermionic 173Yb atoms in a crossed optical dipole trap. The elastic collision rate, which is important for the evaporation, turns out to be large enough from our study. This large collision rate leads to efficient evaporation and we have successfully cooled the atoms below 0.6 of the Fermi temperature, that is to say, to a quantum degenerate regime. In this regime, a plunge of evaporation efficiency is observed as the result of the Fermi degeneracy.
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