Fig. 2: Phase diagrams of the system.
From: Density-wave ordering in a unitary Fermi gas with photon-mediated interactions
a, Photon traces recorded at fixed Δc = −2π × 2 MHz as a function of the linearly increasing pump strength V0 for different values of the short-range interaction parameter 1/kFa spanning the strongly interacting regime of the BCS–BEC crossover. Each measurement features a sharp increase of the photon count rate above a critical value of the pump strength V0C (dashed vertical lines). b, Phase diagram of the unitary Fermi gas in the V0–Δc plane, exhibiting DW self-ordering. The solid line is a theory estimate of the phase boundary (in the text). c, Measurement of the critical long-range interaction strength \({{\mathcal{D}}}_{0{\rm{C}}}\) as a function of the contact interaction parameter at fixed Δc = 6δc. Above the critical value, the system exhibits a modulated density, depicted by the oblique stripes. The solid line is the critical interaction strength calculated from theory. Insets display phase diagrams measured in the BCS and BEC regimes for the same parameter range as the one of b. Error bars represent standard deviations.
