LOCALIZED EXCITONS AND BREAKING OF CHEMICAL-BONDS AT III-V (110)SURFACES

被引：44

作者：

PANKRATOV, O ^{[1
]}

SCHEFFLER, M ^{[1
]}

机构：

[1] MAX PLANCK GESELL,FRITZ HABER INST,FARADAYWEG 4-6,D-14195 BERLIN,GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.75.701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Electron-hole excitations in the surface bands of GaAs(110) are analyzed using constrained density-functional theory calculations. The results reveal formation of autolocalized Frenkel-type excitons which merge in microscopic ''droplets'' due to attraction initiated by exciton-induced unrelaxation of the surface. A substantial weakening of the bonding of the topmost Ga atom is found in such an ''exciton droplet.'' This finding suggests a microscopic mechanism of laser-induced emission of the neutral Ga atoms from GaAs and GaP (110) surfaces.

引用

页码：701 / 704

页数：4

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