Figure 2: Ruthenium band structure.

(a,b) Photoemission spectra recorded along the high-symmetry direction Γ₁−S for incident circularly polarized light with photon energies hν as indicated. Dark colours correspond to high intensities. Blue points in a show the momentum distribution curve at the binding energy indicated by the horizontal dashed line. The double peak structure is attributed to the band. (c) Energy distribution curves (EDCs) at the S point, normalized at binding energy =E−E_F=−1.8 eV. (d,e) Linear light polarization dependence along the S−Γ₂ direction at hν=65 eV. (f) EDCs at the momentum indicated by the vertical dashed lines. In both (c,f), the and bands are indicated by red and grey shading, respectively.