NEXT-NEAREST NEIGHBOR FORCES IN DIATOMIC SUPERLATTICES

被引：3

作者：

HADIZAD, R

TILLEY, DR

TILLEY, J

机构：

[1] Dept. of Phys., Essex Univ., Colchester

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1991年 / 3卷 / 48期

关键词：

D O I：

10.1088/0953-8984/3/48/011

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Results are presented for phonons in a 1D diatomic model superlattice. Each frequency-omega corresponds to two Bloch wavenumbers Q1 and Q2. For alpha < 0.25, where alpha is the ratio of next-nearest to nearest force constants, the results are essentially a perturbation of those found with nearest-neighbour forces only. For alpha > 0.25, however, qualitatively new results are found, and in particular both Q1 and Q2 can be real over some frequency range. Illustrative dispersion curves are presented.

引用

页码：9697 / 9703

页数：7

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