Fig. 5
From: Superconducting gap anisotropy sensitive to nematic domains in FeSe
Superconducting gap anisotropy of multi- and single-domain FeSe. a Superconducting gap anisotropy of the elliptical FS, shown in Cartesian coordinates. Results of the multi-domain samples (red circle) and single-domain samples (green triangle) are shown together. 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 samples, considering the twofold orthorhombic symmetry. The fitting function is \(\Delta (\theta ) = |A + B\;{\rm{cos}}(2\theta ) + C\;{\rm{cos}}(4\theta ) + D\;{\rm{cos}}(6\theta ) + E\;{\rm{cos}}(8\theta )|\). Schematic description of gap signs on the Γ-centered FS assuming b a single node and c two nodes. The red (green) line indicates Δ > 0 (<0), and the black circles are the positions of nodes. Definition of θ is shown
