Comment on “Surface Pair-Density-Wave Superconducting and Superfluid States”

Figure 1

The critical Zeeman field of a 2D $s$-wave superconductor with cylindrical Fermi surface, and atomically smooth boundary [$\underset{\_}{\widehat{p}}=\widehat{p}-2\widehat{z}(\widehat{z}·\widehat{p})$]. $H_c$ for the surface FFLO state (solid and dotted lines) never exceeds the bulk critical field (open circles). Inset: profiles of the order parameter emerging at transition points $A$, $B$, $C$.