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Optical properties of alkali-earth atoms and Na_2 calculated by GW and Bethe-Salpeter equations

机译:GW和Bethe-Salpeter方程计算的碱土原子和Na_2的光学性质

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Starting from the GW approximation (GWA) beyond density functional theory and solving the eigenvalue problem associated with the Bethe-Salpeter equation which accounts for the excitonic effect, I have determined optical properties of isolated Be, Mg and Ca atoms and Na_2. In the representation of single electron wave functions, I have used the all-electron mixed basis approach in which both plane waves and atomic orbitals are used as a basis set. The resulting quasiparticle energies and optical absorption spectra are compared with available experimental data.
机译:从超越密度泛函理论的GW近似(GWA)开始,并解决了与引起激子效应的Bethe-Salpeter方程有关的特征值问题,我确定了孤立的Be,Mg和Ca原子以及Na_2的光学性质。在表示单电子波函数时,我使用了全电子混合基方法,其中平面波和原子轨道都用作基集。将所得的准粒子能量和光吸收光谱与可用的实验数据进行比较。

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