Fermi Degeneracy

We’re are now reliably creating degenerate Fermi gases of around 1 million lithium atoms in the crossed beam dipole trap in the 3DMOT chamber.At the moment this is a weakly-interacting Fermi gas that is mixture of the the lowest two hyperfine states, and a magnetic field of around 350 gauss. So far we’ve seen T/TFermi of about 0.4, but this is rather beside the point since we’ll be moving the atoms into a glass “science” cell at a temperature well above degeneracy.  It’s nice to see the cooling process working so nicely, with a vacuum lifetime of almost a minute. It will be fun to eventually throw Li-7 back in the mix and cool both isotopes simultaneously, but for now we’ll continue the march to the ring trap in the science cell.