AMPLIFICATION OF ACOUSTIC-WAVES DUE TO AN EXTERNAL TEMPERATURE-GRADIENT IN SUPERLATTICES

被引：5
|
作者：
MENSAH, SY
KANGAH, GK
机构：
[1] Dept. of Phys., Cape Coast Univ.
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 1991年 / 3卷 / 22期
关键词：
D O I：
10.1088/0953-8984/3/22/020
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Amplification of short-wave sound propagating along the axis of a semiconductor superlattice by electrons of the lowest miniband in an external temperature gradient is investigated theoretically. The mechanism of absorption of phonons is due to Landau damping. Unlike a homogeneous material, the threshold field at which absorption turns over to amplification depends on the superlattice parameters and the wavelength of the sound wave.
引用
收藏
页码：4105 / 4107
页数：3
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