Speed of the Goldstone Sound Mode of an Atomic Fermi Gas Loaded on a Square Optical Lattice with a Non-Abelian Gauge Field in the Presence of a Zeeman Field
Chemical potential , pairing gap , and the slope of the Goldstone sound mode of a Fermi gas in a square optical lattice subject to a non-Abelian gauge field with as a function of the Zeeman field . The chemical potential and the gap are obtained by solving the mean field number and gap equations (13)-(14). The arrows show the values of the Zeeman field for which the opening and closing of a gap take place. The insert shows the slope close to .