Fig. 4
From: Superconducting gap anisotropy sensitive to nematic domains in FeSe
Superconducting gap anisotropy of the elliptical Fermi surface. Results of the multi-domain sample with p- (red circle) and s- (blue circle) polarized light are shown together, considering that each polarization predominantly probes different domains. Results of the single-domain sample (green triangle) are also shown together. Solid symbols are obtained from BCS spectra fitting and open symbols are symmetrized by taking into account the orthorhombic crystal symmetry. Error bars are determined by the systematic and statistical error of the calibrated EF positions, as explained in Supplementary Note 8. The black curve is fitting to the observed anisotropy of the multi-domain sample, considering the twofold orthorhombic symmetry. The fitting function is \(\Delta (\theta ) = |A + B\;{\rm{cos}}(2\theta ) + C\;{\rm{cos}}(4\theta ) + D\;{\rm{cos}}(6\theta ) + E\;{\rm{cos}}(8\theta )|\)
