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arXiv 0711.4837cond-mat.mtrl-sci
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激发能的非经验元GGA密度泛函的性能

Performance of a non-empirical meta-GGA density functional for excitation energies

Jianmin Tao, Sergei Tretiak, Jian-Xin Zhu

摘要:

在含时密度泛函理论中,绝热近似能很好地描述分子的低激发态。在目前的工作中,绝热非经验元广义梯度近似(元GGA)的陶,Perdew,Staroverov,和Scuseria(TPSS)描述原子和分子激发的能力进行了测试。绝热(单参数)混合版本的TPSS元GGA和绝热GGA的Perdew,伯克,和恩泽霍夫(PBE)也包括在测试中。结果进行了比较实验和两个完善的混合泛函PBE 0和B3LYP。计算结果表明,绝热TPSS和TPSSh泛函产生的激发能与实验符合得相当好,并且改进了绝热局域自旋密度近似,特别是绝热PBE GGA.这进一步证实了TPSS确实是一个可靠的非混合通用功能,可以作为起点,从更高级别的近似可以构建。绝热近似下含时密度泛函分子的低垂直激发能的系统低估表明,可以进一步改进与非绝热修正。

英文摘要:

It is known that the adiabatic approximation in time-dependent density functional theory usually provides a good description of low-lying excitations of molecules. In the present work, the capability of the adiabatic nonempirical meta-generalized gradient approximation (meta-GGA) of Tao, Perdew, Staroverov, and Scuseria (TPSS) to describe atomic and molecular excitations is tested. The adiabatic (one-parameter) hybrid version of the TPSS meta-GGA and the adiabatic GGA of Perdew, Burke, and Ernzerhof (PBE) are also included in the test. The results are compared to experiments and to two well-established hybrid functionals PBE0 and B3LYP. Calculations show that both adiabatic TPSS and TPSSh functionals produce excitation energies in fairly good agreement with experiments, and improve upon the adiabatic local spin density approximation and, in particular, the adiabatic PBE GGA. This further confirms that TPSS is indeed a reliable nonhybrid universal functional which can serve as the starting point from which higher-level approximations can be constructed. The systematic underestimate of the low-lying vertical excitation energies of molecules with time-dependent density functionals within the adiabatic approximation suggests that further improvement can be made with nonadiabatic corrections.

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