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Improving accuracy and efficiency of calculations of photoemission spectra within the many-body perturbation theory

机译:在多体摄动理论中提高光发射光谱计算的准确性和效率

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摘要

We present an approach to evaluate quasiparticle energies within many-body perturbation theory that substantially improves both the computational efficiency and numerical accuracy of existing techniques. We use the eigenvectors of the static dielectric matrix as a basis for the frequency-dependent density-density response function, and density functional perturbation theory to avoid the explicit calculation of empty electronic states, and storage and inversion of large dielectric matrices. The numerical accuracy of our approach is controlled by a single parameter that can be systematically varied to test the convergence of the computed quasiparticle energies. We discuss the advantages of the technique by presenting the calculations of the vertical ionization potential and electron affinity of several molecules and clusters, including benzene and diamondoids.
机译:我们提出了一种在多体摄动理论中评估准粒子能量的方法,该方法极大地提高了现有技术的计算效率和数值精度。我们使用静态介电矩阵的特征向量作为与频率相关的密度-密度响应函数的基础,并使用密度函数微扰理论来避免显式计算空电子态以及大型介电矩阵的存储和反演。我们方法的数值精度由单个参数控制,该参数可以系统地改变以测试所计算的准粒子能量的收敛性。通过介绍几种分子和簇(包括苯和类金刚石)的垂直电离势和电子亲和力的计算,我们讨论了该技术的优势。

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  • 来源
    《Physical review》 |2012年第8期|p.081101.1-081101.5|共5页
  • 作者单位

    Department of Chemistry, University of California, Davis, California 95616, USA Center for Computational Physics, Institute of Physics, Vietnam Academy of Science and Technology (VAST),P.O. Box 429, 10000 Hanoi, Vietnam;

    Department of Chemistry, University of California, Davis, California 95616, USA;

    Department of Chemistry, University of California, Davis, California 95616, USA;

    Department of Chemistry, University of California, Davis, California 95616, USA Department of Physics, University of California, Davis, California 95616, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    excited states: methodology; density functional theory, local density approximation, gradient and other corrections;

    机译:激发态:方法论密度泛函理论;局部密度近似;梯度和其他校正;

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