Fig. 3: Schematic illustration of the Ising superconductor pairing symmetry.
From: Electron-phonon coupling and spin fluctuations in the Ising superconductor NbSe2
Schematic illustration of possible pairing symmetry in a regular superconductor with hybridization-split, Kramers-degenerate Fermi surfaces (with inversion symmetry), and in an Ising superconductor. Splitting and superconductivity on the Γ pocket are neglected. The color shows the sign of the order parameter. a, c correspond to an s-wave, and b, d to a f-wave symmetry. Note that in the IS the order parameter cannot be independently defined for k and −k, so only one is shown.
