WIDG Seminar: Yunpeng Ji, Yale University, “Many-body Physics with Ultracold Homogeneous Fermi Gases”

From superconductors, quark–gluon plasmas to neutron stars, interacting fermions are at the center of some of the most important problems in modern physics. The realization of degenerate Fermi gases with ultracold atoms has offered a versatile platform to experimentally investigate some of those problems, with unprecedented tunability of inter-particle interactions and trapping geometries. In particular, novel programmable light sculpting devices have enabled us to trap atoms in a uniform box potential, thus realizing the textbook homogeneous Fermi gas. It provides us with opportunities to measure quantities that were previously challenging to extract from inhomogeneous samples, and observe fragile exotic phases previously masked by density variations. In this talk I will present our apparatus to produce uniform Fermi gases with Li-6 atoms, and our latest study on the stability of the repulsive Fermi gas with short range interactions.
Host: Tong Liu
Zoom connection: https://yale.zoom.us/j/754440361