Fig. 1: Crystal structure and electronic structure of PtPb4.
From: Nonsymmorphic symmetry-protected band crossings in a square-net metal PtPb4
a Top view and side view of the crystal structure of PtPb4 (Pt: blue; Pb: gold). An illustration of a nonsymmorphic group operation is indicated at the bottom that includes a mirror reflection and a translation. b Measured Fermi surface in the kx–ky plane integrated within 10 meV of the Fermi level. The polarization vector is as shown. DFT slab calculation is shown for comparison. c ARPES constant energy contour at −0.6 eV below the Fermi level. A corresponding slab calculation is shown. d Band dispersions measured along the Γ–X–M direction. e Calculated kz-integrated dispersions along Γ–X–M from slab calculation. Only bulk states are shown. Spin–orbit coupling (SOC) is not included in this set of calculations. f Constant energy contour taken at −0.6 eV from a photon energy dependence study. An inner potential of 17 eV was used. Selected bulk bands that are dispersive along kz are marked. g A dispersion cut along cut 1 shown in f. h, i Measured dispersions taken at 137 and 165 eV, respectively. Data in b, c are taken at 25 K. Data in d are taken at 100 K.
