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arXiv 2107.13631physics.chem-ph
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使用密度一致有效势方法得到自相互作用修正的Kohn-Sham有效势

Self-interaction corrected Kohn-Sham effective potentials using the density-consistent effective potential method

Carlos M. Diaz, Luis Basurto, Santosh Adhikari, Yoh Yamamoto, Adrienn Ruzsinszky, Tunna Baruah, Rajendra R. Zope

AI总结:

针对近似密度泛函自相互作用误差导致Kohn-Sham本征值低估电离能的问题,本研究调整实现密度一致有效势方法,结合FLOSIC方案得到自相互作用修正的局域有效势,在分子和多并苯体系的态密度、带隙计算上优于未修正方法,更贴合实验值。

摘要:

密度泛函理论(DFT)及超越DFT的方法常与光电子能谱结合使用,以获取分子和固体电子结构的物理见解。除最高占据轨道外,Kohn-Sham本征值并非电子移去能。由于近似密度泛函中的自相互作用(SI)误差,最高占据分子轨道的本征值通常会低估电子移去能或电离能。本研究中,我们调整并实现了Kohut、Ryabinkin与Staroverov提出的密度一致有效势(DCEP)方法,以在FLOSIC方案中从经SI修正的Fermi-Löwdin轨道和密度得到经SI修正的局域有效势。该实现被用于获取一组分子和多并苯的态密度(光电子能谱)及HOMO-LUMO带隙。与一系列未经SI修正的密度泛函近似相比,本方法的结果与实验值吻合良好。

英文摘要:

Density functional theory (DFT) and beyond-DFT methods are often used in combination with photoelectron spectroscopy to obtain physical insights into the electronic structure of molecules and solids. The Kohn-Sham eigenvalues are not electron removal energies except for the highest occupied orbital. The eigenvalues of the highest occupied molecular orbitals often underestimate the electron removal or ionization energies due to the self-interaction (SI) errors in approximate density functionals. In this work, we adapt and implement the density-consistent effective potential(DCEP) method of Kohut, Ryabinkin, and Staroverov to obtain SI corrected local effective potentials from the SI corrected Fermi-Löwdin orbitals and density in the FLOSIC scheme. The implementation is used to obtain the density of states (photoelectron spectra) and HOMO-LUMO gaps for a set of molecules and polyacenes. Good agreement with experimental values is obtained compared to a range of SI uncorrected density functional approximations.

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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