Figure 1

The $T=0$ phase diagram. Phases are shown in terms of the interaction $g$. For weak coupling, $g\lesssim 0.4$, the Fermi pressure stabilizes the system for all angles. For stronger coupling, there is a critical angle ${\Theta }_c$ below which the attractive interaction overcomes the Fermi pressure and the gas collapses. The system is superfluid and stable for ${\Theta }_c<\Theta <{\Theta }_s$. The superfluid and normal regions are separated by a quantum phase transition. For comparison, we also plot as dashed lines the phase diagram calculated with no Fermi surface deformation effects ($\alpha =1$).Reuse & Permissions

Figure 2

The deformation parameter $\alpha$ and the coupling strength $g_s(k_F,k_F)$ for $p$-wave pairing along the critical line for collapse ${\Theta }_c(g)$. For $g\lesssim 0.4$, where there is no collapse, we have evaluated $\alpha$ and $g_s$ at $\Theta =0$.Reuse & Permissions