Fig. 2: Fermiology and topology of the (001) surface electronic structure in PrAlGe.
From: Observation of Weyl fermions in a magnetic non-centrosymmetric crystal
a Low-energy ARPES-measured Fermi surface and constant binding energy contours obtained with incident photon energies of 50 eV at T ≈ 11K. Blue dashed line: one quadrant of the surface Brillouin zone. b ARPES-measured Fermi surface with guides to the eye (white dashed line) tracking the “U” shaped candidate topological Fermi arc state. c Left: energy-momentum cut and, right: MDCs fitted at different binding energies with Lorentzian functions to track the candidate arc (blue dashed line) and bulk states (black dashed lines). The corresponding path is shown in b. d Photon-energy dependent ARPES along the horizontal line in b. Negligible kz dispersion is observed for the candidate “U” shaped topological Fermi arc (blue arrow). Strong photon-energy dependence is observed for other states nearby (black arrow), suggesting that they are bulk states.
