Fig. 3: Two-dimensional Fermi surface maps.

Angular distributions, typically 500×500 pixels, of the photoemission intensity within the solid angle of ~30° and kinetic energy interval 5-20 meV in the vicinity of the Fermi level. a Angular distributions from TiTe₂ recorded at two synchrotron light sources. Lower energies - BESSY (6 K), higher energies - ASTRID2 (35 K). b Off-normal (~5°) emission laser (6 eV) data from Bi₂Te₃. recorded using left- and right-hand circularly polarized light, as well as their difference. T = 3 K. c Temperature-dependent data from LiFeAs and their difference. d Off-normal (~3°) emission data from Bi₂Te₃ recorded at different time after cleavage. T = 3 K. e The same as d, but taken earlier (after ~5 h) and from different positions at the cleaved surface. f Angular distributions from different materials. First four maps are recorded at BESSY at approximately 6 K. Two other maps—in the laboratory using the laser at 3 K.