PHONONS IN PARABOLIC QUANTUM-WELLS

被引：14

作者：

BECHSTEDT, F

GRILLE, H

HAUPT, R

机构：

[1] Friedrich-Schiller-Universität, D-07743 Jena

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.48.14667

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Phonons in parabolic-quantum-well structures fabricated with semiconductor alloys are studied. We calculate frequencies, displacement patterns, and densities of states for lattice vibrations in a (GaAs)N1(Ga1-xAlxAs)N2(001) superlattice where the GaAs layers are replaced by a mixed crystal Ga1-xsAlxsAs with Al fraction x(s) varying quadratically with atomic layer s. The influence of disorder, composition, and the two-mode behavior of optical phonons are investigated within a random-element-isodisplacement model, generalized to layered structures with arbitrary composition profiles.

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页码：14667 / 14670

页数：4

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