Extended Data Fig. 7: Se contributions in the ARPES data of PdSe₂.

a,b, Crystal structure of PdSe₂ illustrated by the ball-and-stick model and viewed from the top (a) and the side (b). The 8 Se atoms in the primitive cell are labelled A1–D1 and A2–D2. c,d, ARPES data of PdSe₂, taken by the s-polarised light of 87 eV (k_z = Γ₆) at the scattering plane of xz (c) and yz (d), and plotted at E = –0.4 eV as a function of k_x and k_y. e,f, Part of constant-energy maps marked in c,d by red squares and shown in the extremely narrow colour scale. g,h, ARPES data of PdSe₂ shown in k_y (g) and k_x (h) along the grey dotted lines in e,f, respectively. i,j, Relative phases of ϕ_A1C1/B1D1 (i) and ϕ_A1B1/C1D1 (j) obtained from tight-binding models and shown at k_z = Γ_2n for the same area as in e,f (ϕ_A1C1/B1D1 = ϕ_C2A2/D2B2, ϕ_A1B1/C1D1 = ϕ_A2B2/C2D2). The colour scale in units of radian is given at the bottom. k-n, Corresponding simulations of constant-energy maps (k,l) and band dispersions (m,n) with relative phases in i,j and sublattice interference. There is overall little ARPES intensity on the valence band of PdSe₂ taken by s-polarised light in c,d. However, if narrowing down the intensity scale for the area marked by the red square, we found there is a remnant feature with the intensity pattern that vanishes at k_y = 0 along the k_x axis in e and at k_x = 0 along the k_y axis in f. Even these characteristic intensity patterns can be reproduced well by ARPES simulations based on the model of quantum interference between 8 Se atoms (see Methods), as shown in k-n.