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arXiv 2201.00901cond-mat.mtrl-sciphysics.comp-ph
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无轨道密度泛函理论的非定域赝能量密度泛函

Nonlocal Pseudopotential Energy Density Functional for Orbital-Free Density Functional Theory

Qiang Xu, Cheng Ma, Wenhui Mi, Yanchao Wang, Yanming Ma

摘要:

无轨道密度泛函理论(OF-DFT)以低计算成本运行,与模拟原子的数量成线性比例,使其适合于大规模材料模拟。一般认为,OF-DFT严格要求使用局域赝势,而不是轨道相关的非局域赝势,用于计算电子-离子相互作用能,因为没有轨道可用。这是不幸的情况,因为已知非局部赝势比局部赝势具有更好的可传递性和计算精度。我们在这里报告的理论方案,允许直接使用非局部赝势OF-DFT的发展。在这个方案中,一个非局域赝势能量密度泛函是由非局域赝势投影到非相互作用的密度矩阵(而不是“轨道”),可以近似为电子密度的函数。我们的发展挑战的信念,非局部赝势不适用于OF-DFT,导致创建一个替代的理论框架OF-DFT的工作优于传统的。

英文摘要:

Orbital-free density functional theory (OF-DFT) runs at low computational cost that scales linearly with the number of simulated atoms, making it suitable for large-scale material simulations. It is generally considered that OF-DFT strictly requires the use of local pseudopotentials, rather than orbital-dependent nonlocal pseudopotentials, for the calculation of electron-ion interaction energies, as no orbitals are available. This is unfortunate situation since the nonlocal pseudopotentials are known to give much better transferability and calculation accuracy than local ones. We report here the development of a theoretical scheme that allows the direct use of nonlocal pseudopotentials in OF-DFT. In this scheme, a nonlocal pseudopotential energy density functional is derived by the projection of nonlocal pseudopotential onto the non-interacting density matrix (instead of 'orbitals') that can be approximated explicitly as a functional of electron density. Our development defies the belief that nonlocal pseudopotentials are not applicable to OF-DFT, leading to the creation of an alternate theoretical framework of OF-DFT that works superior to the traditional one.

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