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Exploring the random phase approximation: Application to CO adsorbed on Cu(111)

机译:探索随机相近似:应用于吸附在Cu(111)上的CO

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摘要

The adsorption of CO on the Cu(111) surface is investigated in the random phase approximation (RPA) as formulated within the adiabatic connection fluctuation-dissipation theorem. The RPA adsorption energy is obtained by adding a "local exchange-correlation correction" that is extrapolated from cluster calculations of increasing size, to the Perdew-Burke-Ernzerhof (PBE) value for the extended system. In comparison to density-functional theory calculations with the generalized gradient functionals PBE and AM05 and the hybrid functional PBE0 and HSE03, we find a hierarchy of improved performance from AM05/PBE to PBE0/HSE03, and from PBE0/HSE03 to RPA, both in terms of the absolute adsorption energy as well as the adsorption-energy difference between the atop and the hollow fee sites. In particular, the very weak atop site preference at the PBE0/HSE03 level is further stabilized by about 0.2 eV in the RPA. The mechanism behind this improvement is analyzed in terms of the GW density of states that gives a spectral representation en par with the RPA formalism for the total energy.
机译:按照绝热连接波动-耗散定理中提出的随机相近似(RPA),研究了CO在Cu(111)表面的吸附。 RPA吸附能是通过将“局部交换相关校正”(从扩展大小的群集计算中得出)添加到扩展系统的Perdew-Burke-Ernzerhof(PBE)值中而获得的。与使用广义梯度函数PBE和AM05以及混合函数PBE0和HSE03进行的密度泛函理论计算相比,我们发现从AM05 / PBE到PBE0 / HSE03以及从PBE0 / HSE03到RPA的性能都有改进绝对吸附能以及顶部和空心电荷位点之间的吸附能差。特别地,在RPA中,在PBE0 / HSE03水平上非常弱的顶部位点偏好进一步稳定了约0.2eV。根据状态的GW密度分析了这种改进的机制,该状态的GW密度与RPA形式主义相比具有总能量的频谱表示。

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