Abstract
We report quantum degeneracy in a gas of ultracold fermionic 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 .
- Received 5 May 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.030402
©2010 American Physical Society