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arXiv 1402.3209physics.chem-phcond-mat.mtrl-sciphysics.atom-ph
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系综密度泛函理论中的精确和近似Kohn-Sham势

Exact and approximate Kohn-Sham potentials in ensemble density-functional theory

Zeng-hui Yang, John R. Trail, Aurora Pribram-Jones, Kieron Burke, Richard J. Needs, Carsten A. Ullrich

摘要:

我们从氦原子的基态和激发态构造了适用于系综密度泛函理论(EDFT)的精确Kohn-Sham势.的交换相关(XC)的潜在的准局域密度近似和单行列式和对称本征态鬼校正的精确交换近似进行了比较。对称本征态Hartree交换恢复了精确XC势的独特特征,并用于计算相关势。不同于确切的情况下,从这些近似计算的激发能依赖于系综重量,它表明,只有对称本征态方法产生系综导数不连续。在渐近和近基态行为的精确和近似XC电位的差异进行了讨论的背景下,产生准确的光学间隙。

英文摘要:

We construct exact Kohn-Sham potentials for the ensemble density-functional theory (EDFT) from the ground and excited states of helium. The exchange-correlation (XC) potential is compared with the quasi-local-density approximation and both single determinant and symmetry eigenstate ghost-corrected exact exchange approximations. Symmetry eigenstate Hartree-exchange recovers distinctive features of the exact XC potential and is used to calculate the correlation potential. Unlike the exact case, excitation energies calculated from these approximations depend on ensemble weight, and it is shown that only the symmetry eigenstate method produces an ensemble derivative discontinuity. Differences in asymptotic and near-ground-state behavior of exact and approximate XC potentials are discussed in the context of producing accurate optical gaps.

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