中国物理B ›› 2015, Vol. 24 ›› Issue (10): 107804-107804.doi: 10.1088/1674-1056/24/10/107804

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Exploring positron characteristics utilizing two new positron-electron correlation schemes based on multiple electronic structure calculation methods

张文帅a b, 谷冰川a b, 韩小溪a b, 刘建党a b, 叶邦角a b   

  1. a Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;
    b State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2015-04-23 修回日期:2015-06-02 出版日期:2015-10-05 发布日期:2015-10-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11175171 and 11105139).

Exploring positron characteristics utilizing two new positron-electron correlation schemes based on multiple electronic structure calculation methods

Zhang Wen-Shuai (张文帅)a b, Gu Bing-Chuan (谷冰川)a b, Han Xiao-Xi (韩小溪)a b, Liu Jian-Dang (刘建党)a b, Ye Bang-Jiao (叶邦角)a b   

  1. a Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;
    b State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
  • Received:2015-04-23 Revised:2015-06-02 Online:2015-10-05 Published:2015-10-05
  • Contact: Ye Bang-Jiao E-mail:bjye@ustc.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11175171 and 11105139).

摘要:

We make a gradient correction to a new local density approximation form of positron-electron correlation. The positron lifetimes and affinities are then probed by using these two approximation forms based on three electronic-structure calculation methods, including the full-potential linearized augmented plane wave (FLAPW) plus local orbitals approach, the atomic superposition (ATSUP) approach, and the projector augmented wave (PAW) approach. The differences between calculated lifetimes using the FLAPW and ATSUP methods are clearly interpreted in the view of positron and electron transfers. We further find that a well-implemented PAW method can give near-perfect agreement on both the positron lifetimes and affinities with the FLAPW method, and the competitiveness of the ATSUP method against the FLAPW/PAW method is reduced within the best calculations. By comparing with the experimental data, the new introduced gradient corrected correlation form is proved to be competitive for positron lifetime and affinity calculations.

关键词: positron annihilation, positron lifetime, electronic structure

Abstract:

We make a gradient correction to a new local density approximation form of positron-electron correlation. The positron lifetimes and affinities are then probed by using these two approximation forms based on three electronic-structure calculation methods, including the full-potential linearized augmented plane wave (FLAPW) plus local orbitals approach, the atomic superposition (ATSUP) approach, and the projector augmented wave (PAW) approach. The differences between calculated lifetimes using the FLAPW and ATSUP methods are clearly interpreted in the view of positron and electron transfers. We further find that a well-implemented PAW method can give near-perfect agreement on both the positron lifetimes and affinities with the FLAPW method, and the competitiveness of the ATSUP method against the FLAPW/PAW method is reduced within the best calculations. By comparing with the experimental data, the new introduced gradient corrected correlation form is proved to be competitive for positron lifetime and affinity calculations.

Key words: positron annihilation, positron lifetime, electronic structure

中图分类号:  (Positron annihilation)

  • 78.70.Bj
71.60.+z (Positron states) 71.15.Mb (Density functional theory, local density approximation, gradient and other corrections)