Fig. 2: Ordering close to a photo-association transition.
From: Cavity-mediated charge and pair-density waves in a unitary Fermi gas
a Dispersive shift δc measured by transmission spectroscopy as a function of the molecular detuning Δm, showing the avoided crossing pattern characteristic of strong light-matter coupling. b Photon flux traces as a function of pump strength V0 while varying Δm across the photoassociation transition at fixed Δc/2π = −5.5 MHz. The blue-red line indicates the Fano-type phase boundary predicted in Fig. 1b, with an overall scaling factor left as a free parameter for the V0 axis, and the other parameters calculated using a mean-field theory. The two sharp features located around Δm/2π = 150 and 180 MHz are due to another weakly coupled photoassociation transition, leading to sharp losses without significantly affecting the atom-cavity coupling.
