微扰理论在优化有效势法上的应用
Perturbation Theory on Top of Optimized Effective Potential Method
摘要:
我们提出了一个微扰方法的范围内的Kohn-Sham密度泛函理论(DFT)。该方法是基于精确的交换优化有效势方法,并通过使用瑞利-薛定谔(RS)微扰理论(PT)的微扰展开包括相关。关联势由RS计算的Moller-Plesset公式构造。这自然会导致一个新的迭代格式时,有限阶摄动理论。新的迭代过程可以被看作是一个自洽的无参数DFT PT,因此,提供了相关能量,这是明确的自洽轨道,本征值和交换相关势的功能。
英文摘要:
We present a perturbative approach within the scope of Kohn-Sham density functional theory (DFT). The method is based on the exact exchange-only optimized effective potential method, and correlation is included via perturbation expansion using Rayleigh-Schrodinger (RS) perturbation theory (PT). The correlation potential is constructed from Moller-Plesset formulation of RS calculations. This naturally leads to a new iterative scheme when finite order perturbation theory is employed. The new iterative procedure can be taken as a self-consistent parameter-free DFT PT, and, as such, provides correlation energy which is explicitly functional of the self-consistent orbitals, eigenvalues and also of the exchange-correlation potential.
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