Isosurfaces of valence charge density (upper panels) and exciton distribution (lower panels) in Si (left panels) and in ZnO (right panels).
From the article:
Origin of the Variation of Exciton Binding Energy in SemiconductorsMarc Dvorak, Su-Huai Wei, and Zhigang Wu
Phys. Rev. Lett. 110, 016402 (2013)
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