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Efficient GW calculations for SnO_2, ZnO, and rubrene: The effective-energy technique

机译:SnO_2,ZnO和红荧烯的有效GW计算:有效能量技术

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In a recent Rapid Communication [J. A. Berger, L. Reining, and F. Sottile, Phys. Rev. B 82,041103(R) (2010)], we presented the effective-energy technique to evaluate, in an accurate and numerically efficient manner, electronic excitations by reformulating spectral sum-over-states expressions such that only occupied states appear. In our approach all the empty states are accounted for by a single effective energy that can be obtained from first principles. In this work we provide further details of the effective-energy technique, in particular, when combined with the GW method, in which a huge summation over empty states appears in the calculation of both the screened Coulomb interaction and the self-energy. We also give further evidence of the numerical accuracy of the effective-energy technique by applying it to the technological important materials SnO_2 and ZnO. Finally, we use this technique to predict the band gap of bulk rubrene, an organic molecular crystal with a 140-atom unit cell.
机译:在最近的快速沟通[J. A. Berger,L。Reining和F. Sottile,物理学。修订版B 82,041103(R)(2010)]中,我们提出了一种有效能量技术,可通过重新计算频谱求和状态表达式,使得仅出现占据状态,从而以准确,高效的方式评估电子激发。在我们的方法中,所有空状态都是由可以从第一原理中获得的单个有效能量来解决的。在这项工作中,我们提供了有效能量技术的更多细节,特别是当与GW方法结合使用时,在计算屏蔽的库仑相互作用和自能量时,空状态的总和会出现。通过将其应用于重要的技术材料SnO_2和ZnO,我们还将进一步证明有效能量技术的数值准确性。最后,我们使用这种技术预测块状红荧烯的带隙,块状红荧烯是具有140个原子晶胞的有机分子晶体。

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