Probing and studying homogeneous atomic Fermi gases

We create and study homogeneous Fermi gases of ultracold atoms in uniform trapping potentials. The homogeneity of the gas enables the measurement of momentum distributions without density averaging. For the non-interacting Fermi gas, we observe the emergence of the Fermi surface and the saturated occupation of one particle per momentum state. For thermodynamic measurements, we convert the uniform trap into a hybrid potential that is harmonic in one dimension and uniform in the other two. The spatially resolved compressibility reveals the superfluid transition in a spin-balanced Fermi gas, saturation in a fully polarized Fermi gas, and strong attraction in the polaronic regime of a partially polarized Fermi gas. In addition, we present results on the temperature dependence of the contact of the unitary Fermi gas measured with radio-frequency spectroscopy.