Degenerate Fermi Gas of $^{87}$Sr
B. J. DeSalvo, M. Yan, P. G. Mickelson, Y. N. Martinez de Escobar, and, T. C. Killian
TL;DR
This paper reports achieving quantum degeneracy in a gas of ultra-cold fermionic $^{87}$Sr atoms through evaporative cooling, demonstrating key signatures of degeneracy in momentum distribution and evaporation efficiency.
Contribution
First demonstration of quantum degeneracy in $^{87}$Sr fermionic atoms using evaporative cooling in an optical trap.
Findings
Achieved $T/T_F=0.26$ indicating deep degeneracy.
Observed changes in momentum distribution confirming degeneracy.
Noted decrease in evaporation efficiency below $T/T_F \,\sim\,0.5$.
Abstract
We report quantum degeneracy in a gas of ultra-cold fermionic Sr atoms. By evaporatively cooling a mixture of spin states in an optical dipole trap for 10.5\,s, we obtain samples well into the degenerate regime with . The main signature of degeneracy is a change in the momentum distribution as measured by time-of-flight imaging, and we also observe a decrease in evaporation efficiency below .
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