FIG. 1.

(a) Imaginary part of the dielectric function (top) ε₂(ω) calculated with AI2NBSE (red, solid line) and experiment³⁰ (blue, dotted line) (data taken from Puschnig and Ambrosch-Draxl³¹); and (b) loss function −Im ε⁻¹(ω) (bottom) with (inset) real and imaginary parts of the self-energy calculated from AI2NBSE. The self-energy is calculated from the loss function using the many-pole self-energy method (see text) and is shown relative to the valence band maximum. This self-energy is applied to the LiF K edges providing energy dependent broadening and energy shifts to correct the single-particle energies from DFT.