Fig. 3
From: Superconducting gap anisotropy sensitive to nematic domains in FeSe
Superconducting gap anisotropy of single-domain FeSe without uniaxial tensile strain. a Plots of the ARPES intensity at EF of FeSe as a function of the two-dimensional wavevector measured with p-polarized light. The intensity is obtained by integrating the spectra within 3 meV with respect to EF. Black ellipse indicates the experimental FS. b The same as a but measured with s-polarized light. c ARPES intensity plot above Tc (15 K) at the momentum line shown in a, taken with p-polarized light. Black markers represent the experimental band dispersion determined from momentum distribution curves and energy distribution curves (EDCs) for the α and β band. The Fermi energy εF is shown for the α band. d The same as c but taken below Tc (2 K) and the data are symmetrized with respect to EF. The black arrow indicates the kF position. e Definition of FS angle. The red points indicate the kF values where EDCs in f and g are taken. f EDCs at different kF values along the FS at 15 K (gray) and 2 K (red). Black lines show the fits to the BCS fitting function. The FS angles defined in e are shown for each EDC. g Same as f but symmetrized at EF
