Positron 2D-ACAR study of divacancies in Si: Experiments and theory

M. Hasegawa, Z. Tang, T. Chiba, M. Saito, A. Kawasuso, T. Akahane, Z. Q. Li, Y. Kawazoe, S. Yamaguchi

研究成果: Article査読

2 被引用数 (Scopus)


Two-dimensional angular correlation of annihilation (2D-ACAR) for divacancies in Si with definite charge states (V20, V21- and V22-) are studied theoretically and experimentally. The 2D-ACAR for the various charge states shows almost isotropic and very close to each other. However, using a specimen with aligned divacancies (V21-), we have obtained a small but definite anisotropy in the 2D-ACAR. All these features are well reproduced by first principles calculations based on the two-component density-functional theory. Furthermore calculated anisotropies for the different charge states show systematic changes arising from the bonding character of the divacancy electrons. Theoretical 2D-ACAR is also presented for monovacancies. The present calculation and experiment demonstrate that the 2D-ACAR is an effective tool to provide microscopic information about vacancy-type defects.

ジャーナルMaterials Science Forum
出版ステータスPublished - 1997

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学


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