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arXiv 1206.2234physics.chem-phcond-mat.otherquant-ph
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密度泛函理论中的自旋

Spin in Density-Functional Theory

Christoph R. Jacob, Markus Reiher

摘要:

开壳层分子的精确描述,特别是过渡金属配合物和簇合物的精确描述,仍然是量子化学的一个重要挑战。虽然密度泛函理论(DFT)被广泛应用于这一领域,有时严重的限制,其目前可用的近似实现往往排除其作为一个预测理论的应用。在这里,我们审查的基础DFT应用于开壳层系统,无论是在非相对论和相对论的框架。特别是,我们提供了一个深入的讨论的确切理论,重点是自旋密度的作用和针对特定的自旋状态的可能性。结果表明,对于开壳层体系,存在不同的Kohn-Sham DFT方案,这意味着交换相关能泛函的定义不同,导致交换相关能泛函的精确条件不同。最后,我们提出了未来发展的一些可能方向。

英文摘要:

The accurate description of open-shell molecules, in particular of transition metal complexes and clusters, is still an important challenge for quantum chemistry. While density-functional theory (DFT) is widely applied in this area, the sometimes severe limitations of its currently available approximate realizations often preclude its application as a predictive theory. Here, we review the foundations of DFT applied to open-shell systems, both within the nonrelativistic and the relativistic framework. In particular, we provide an in-depth discussion of the exact theory, with a focus on the role of the spin density and possibilities for targeting specific spin states. It turns out that different options exist for setting up Kohn-Sham DFT schemes for open-shell systems, which imply different definitions of the exchange-correlation energy functional and lead to different exact conditions on this functional. Finally, we suggest some possible directions for future developments.

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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