Phonon focusing in superlattices

被引：17

作者：

Tanaka, Y ^{[1
]}

Narita, M ^{[1
]}

Tamura, S ^{[1
]}

机构：

[1] Hokkaido Univ, Dept Appl Phys, Sapporo, Hokkaido 060, Japan

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1998年 / 10卷 / 39期

关键词：

D O I：

10.1088/0953-8984/10/39/015

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Phonon focusing in periodic superlattices is studied in terms of the plane-wave expansion method rather than the conventional transfer matrix method. At the frequencies where the intramode and intermode Bragg reflections of phonons occur the group velocity of phonons along the growth direction vanishes, giving rise to the disappearance and/or appearance of phonon caustics. This can be explicitly shown by plotting theoretical phonon images in the planes both normal and perpendicular to the growth direction. Numerical examples are given for (001)GaAs/AlAs superlattices.

引用

页码：8787 / 8798

页数：12

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