PHONON DISPERSIONS IN GAXAL1-XAS ALLOYS

被引：104

作者：

BARONI, S ^{[1
]}

DEGIRONCOLI, S ^{[1
]}

GIANNOZZI, P ^{[1
]}

机构：

[1] PHB ECUBLENS,INST ROMAND RECH NUMER PHYS MAT,CH-1015 LAUSANNE,SWITZERLAND

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.65.84

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The vibrational properties of GaxAl1-xAs alloys have been studied using large supercells to simulate the disorder and ab initio interatomic force constants. In agreement with recent experimental evidence, our results indicate that well defined GaAs-like and AlAs-like phonon dispersions exist for any concentration. Besides broadening phonon states with definite wave vector, alloying narrows the optic branches and lowers the longitudinal modes more than the transverse ones, thus reducing the LO-TO splitting. The acoustic bands are instead rather insensitive to the composition. © 1990 The American Physical Society.

引用

页码：84 / 87

页数：4

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