POSITRON STATES IN VACANCIES AND VOIDS

被引:8
作者
DUNN, GM [1 ]
JENSEN, KO [1 ]
WALKER, AB [1 ]
机构
[1] UNIV E ANGLIA,SCH PHYS,NORWICH NR4 7TJ,NORFOLK,ENGLAND
关键词
D O I
10.1088/0953-8984/3/13/007
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We have calculated the positron wavefunctions and annihilation rates in voids in aluminium as functions of void radius using density functional theory with the non-local approximation to the positron-electron correlation potential developed by Jensen and Walker. Our calculations show the gradual evolution of the positron state, as the radius increases, from a state extending over the whole of the defect volume in monovacancies to a state localized at the void surface in large voids. We find that for voids with radii larger than about 5 angstrom the lifetime is independent of void size.
引用
收藏
页码:2049 / 2056
页数:8
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