Fig. 4: Observation of bulk Weyl cones in PrAlGe.
From: Observation of Weyl fermions in a magnetic non-centrosymmetric crystal
a Distribution of equal but opposite chiral charged Weyl fermions (black and white circles) in the right-most (first) quadrant of the surface BZ. All other Weyl fermions are related by mirror symmetry along kx = 0 and ky = 0. The paths of interest are labeled as Cut 1 (green vertical line), Cut 2 (blue horizontal line), and Cut 3 (red horizontal line). b Ab initio calculated bulk Fermi surface (kx, ky) at kz = 0. Symmetric across the \(\overline{\Gamma }-\overline{M}\) high-symmetry line (black dashed line) are the Weyl cones bulk Fermi pockets in each quadrant. c SX-ARPES-measured Fermi surface on the kz = 0 plane with incident photon energy 478eV and T < TC. The paths of interest (Cut 1–3; white dashed lines) correspond to those in a. d–f Energy-dispersion maps along Cut 1–3 with corresponding (g–i) second derivative and (j–l) ab initio calculation plots. The red dashed lines are guides to the eye for the Weyl cones.
