| Abstract: | A gas of ultracold fermionic atoms with tunable interactions serves as an excellent quantum simulator for many fermionic condensed matter systems. In particular, understanding the pairing and condensation of fermions has long been a significant goal. A Fermi gas in the Bose-Einstein-condensate (BEC) to Bardeen–Cooper–Schrieffer (BCS) crossover exhibits the highest known Tc/TF ratio, making it a paradigmatic example of a high-Tc superfluid. In this thesis, we develop and demonstrate a Raman-momentum-transfer probe for strongly interacting ultracold Fermi gases. Using counter-propagating Raman beams tuned between two interacting hyperfine states of 40K , we selectively impart momentum to a chosen spin component and measure the resulting center-of-mass (COM) displacement after time-of-flight. Tuning the s-wave scattering length via a magnetic Feshbach resonance enables us to explore the BEC-BCS crossover and extract interaction-dependent properties. I will present results demonstrating that technique and discuss the insights these experiments can provide. |