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Excitons on a microscopic level: The mixed dynamic structure factor

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Academic year: 2021

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FIG. 1. Dynamic structure factor for q=(-1/2,-1/2,-1/2), G=(0,0,0), G 0 =(1,1,1) in reciprocal lattice units for (a) Si and (b) LiF, obtained from the BSE (blue lines for diagonal and black lines for off-diagonal elements) and within RPA+GW (red lines for
FIG. 3. LiF, absorption spectrum. The reference spectrum in black is the result of a BSE calculation, which is by  defini-tion, and numerically, identical to results obtained in TDDFT using f xc ef f

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