Engineered p-wave collisions in ultracold Fermionic systems

This experiment demonstrates the p-wave and higher odd partial waves describing interactions in a spin polarized Fermi gas: critical for engineering utlracold Fermi gases to support Majorana fermions [1]. Here, we describe an experiment which combines known experimental techniques for modifying interactions between atoms in a unique way to artificially engineer p-wave collisions in ultracold Fermionic systems. Using s-wave Feshbach resonances to tune interactions in degenerate Fermi gases have been very fruitful in studying many-body quantum physics; however, p-Wave Feshbach resonances are limited in their usefulness by large inelastic loss rates [2,3]. In combination with an s-Wave Feshbach resonance, we modify the fermionic interaction by laser-dressing. We already demonstrated that this technique introduces d- and g-wave contributions to the s-wave scattering in degenerate Bose gases [4].\\[4pt] [1] C. Zhang, S. Tewari, R. M. Lutchyn, S. Das Sarma, \textit{Phys. Rev. Lett.} \textbf{101}, 160401 (2008). \newline [2] C. Chin, R. Grimm, P. Julienne, E. Tiesinga, \textit{Rev. Mod. Phys.} \textbf{82}, 1225 (2010). \newline [3] C. A. Regal, C. Ticknor, J. L. Bohn, D. S. Jin, \textit{Phys. Rev. Lett.} \textbf{90}, 053201 (2003). \newline [4] R. A. Williams, et al. \textit{Science} \textbf{335}, 314 (2012).