Carefully converged calculations are performed for the band gap of ZnO within many-body perturbation theory (G^0 W^0 approximation). The results obtained using four different well-established plasmon-pole models are compared with those of explicit calculations without such models (the contour-deformation approach). This comparison shows that, surprisingly, plasmon-pole models depending on the f-sum rule gives less precise results. In particular, it confirms that the band gap of ZnO is underestimated in the G^0 W^0 approach as compared to experiment, contrary to the recent claim of Shih et al.
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Bibliographic reference
Stankovski, Martin ; Antonius, G. ; Waroquiers, David ; Miglio, Anna ; Dixit, H. ; et. al. G0W0 band gap of ZnO: Effects of plasmon-pole models. In: Physical Review B, Vol. 84, no. 24, p. 241201 (2011)