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Ultrasoft pseudopotentials with kinetic energy density support: Implementing the Tran-Blaha potential

机译:具有动能密度支持的超软伪势:实现Tran-Blaha势

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摘要

We extend the Vanderbilt ultrasoft pseudopotential scheme by adding kinetic energy density terms, in order to use meta-GGA exchange potentials, such as the Becke-Johnson or Tran-Blaha potentials, in the plane-wave-pseudopotential implementation of density functional theory. Having implemented kinetic energy augmentation and nonlinear core correction terms in the CASTEP density functional package, we evaluate the validity of our approach by comparing the calculated electronic structure of isolated atoms and semiconductor crystals to all-electron benchmark calculations. Based on our results, we provide recommendations for the practical use of the Tran-Blaha exchange in plane-wave-pseudopotential codes.
机译:我们通过添加动能密度项来扩展Vanderbilt超软拟势方案,以便在密度泛函理论的平面波拟势实现中使用meta-GGA交换势,例如Becke-Johnson或Tran-Blaha势。在CASTEP密度函数包中实现了动能增强和非线性核校正项后,我们通过将孤立原子和半导体晶体的计算电子结构与全电子基准计算进行比较,来评估该方法的有效性。根据我们的结果,我们为Tran-Blaha交换在平面波-伪电位代码中的实际使用提供了建议。

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  • 来源
    《Physical review》 |2019年第23期|235103.1-235103.9|共9页
  • 作者单位

    Rutherford Appleton Lab, Sci Comp Dept, Sci & Technol Facil Council, Didcot OX11 0QX, Oxon, England;

    Univ Oxford, Dept Mat, Oxford OX1 3PH, England;

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  • 正文语种 eng
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