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arXiv 2003.11968cond-mat.mtrl-sci
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包含近似准粒子能量的固体激子效应的有效计算

Efficient Calculation of Excitonic Effects in Solids Including Approximated Quasiparticle Energies

Filipe Matusalem, Marcelo Marques, Ivan Guilhon, Lara K. Teles

摘要:

在这项工作中,我们提出了一个新的程序来计算光谱,包括激子效应和近似的准粒子校正,减少计算工作量。通过求解Bethe-Salpeter方程,考虑准粒子本征能和相应的波函数,用DFT-1/2方法计算了激子对光谱的影响。电子-空穴梯形图用屏蔽交换近似。为了证明该程序的能力,我们比较了Si,Ge,GaAs,GaP,GaSb,InAs,InP和InSb的介电函数的计算虚部与实验数据。正确描述了吸收峰的能量位置。与实验结果的良好协议,以及非常显着减少的计算工作量,使该程序适用于调查的光学光谱的更复杂的复杂系统。

英文摘要:

In this work we present a new procedure to compute optical spectra including excitonic effects and approximated quasiparticle corrections with reduced computational effort. The excitonic effects on optical spectra are included by solving the Bethe-Salpeter equation, considering quasiparticle eigenenergies and respective wavefunctions obtained within DFT-1/2 method. The electron-hole ladder diagrams are approximated by the screened exchange. To prove the capability of the procedure, we compare the calculated imaginary part of the dielectric functions of Si, Ge, GaAs, GaP, GaSb, InAs, InP, and InSb with experimental data. The energy position of the absorption peaks are correctly described. The good agreement with experimental results together with the very significant reduction of computational effort makes the procedure suitable on the investigation of optical spectra of more complex systems.

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