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arXiv 0811.1453cond-mat.mtrl-sci
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弥合密度泛函与多体微扰理论之间的尺度鸿沟

Bridging the size gap between density-functional and many-body perturbation theory

P. Umari, Geoffrey Stenuit, Stefano Baroni

摘要:

基于GW近似的准粒子谱的计算被扩展到数百个原子的系统,从而将当前方法的尺寸范围扩展了一个数量级以上。这是通过一个最佳的策略,使用Wannier类轨道的基础上,评估的极化传播。通过计算苯分子的垂直电离能和晶体硅的能带结构验证了我们的方法。它的潜力,然后证明通过解决准粒子光谱的模型结构的玻璃状二氧化硅,以及四苯基卟啉分子。

英文摘要:

The calculation of quasi-particle spectra based on the GW approximation is extended to systems of hundreds of atoms, thus expanding the size range of current approaches by more than one order of magnitude. This is achieved through an optimal strategy, based on the use of Wannier-like orbitals, for evaluating the polarization propagator. Our method is validated by calculating the vertical ionization energies of the benzene molecule and the band structure of crystalline silicon. Its potentials are then demonstrated by addressing the quasi-particle spectrum of a model structure of vitreous silica, as well as of the tetraphenylporphyrin molecule.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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