Efficient iterative method for solving the Dirac-Kohn-Sham density functional theory
Efficient iterative method for solving the Dirac-Kohn-Sham density functional theory
复制标题
求解 Dirac-Kohn-Sham 密度泛函理论的高效迭代方法
DOI:
10.1016/j.jcp.2013.03.030
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发表时间:
2012-11
影响因子:
4.1
通讯作者:
E, Weinan
中科院分区:
文献类型:
--
作者:
Lin, Lin;Shao, Sihong;E, Weinan
We present for the first time an efficient iterative method to directly solve the four-component Dirac–Kohn–Sham (DKS) density functional theory. Due to the existence of the negative energy continuum in the DKS operator, the existing iterative techniques for solving the Kohn–Sham systems cannot be efficiently applied to solve the DKS systems. The key component of our method is a novel filtering step (F) which acts as a preconditioner in the framework of the locally optimal block preconditioned conjugate gradient (LOBPCG) method. The resulting method, dubbed the LOBPCG-F method, is able to compute the desired eigenvalues and eigenvectors in the positive energy band without computing any state in the negative energy band. The LOBPCG-F method introduces mild extra cost compared to the standard LOBPCG method and can be easily implemented. We demonstrate our method in the pseudopotential framework with a planewave basis set which naturally satisfies the kinetic balance prescription. Numerical results for Pt2, Au2, TlF, and Bi2Se3indicate that the LOBPCG-F method is a robust and efficient method for investigating the relativistic effect in systems containing heavy elements.
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DOI:
10.5860/choice.35-5074
发表时间:
1970
期刊:
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影响因子:
--
作者:
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通讯作者:
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影响因子:
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通讯作者:
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DOI:
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发表时间:
2009-01
期刊:
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影响因子:
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作者:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
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