LONG INTRINSIC RADIATIVE LIFETIMES OF EXCITONS IN QUANTUM WIRES

被引：178
|
作者：
CITRIN, DS
机构：
[1] Max-Planck-Institut für Festkörperforschung, W-7000 Stuttgart 80
来源：
PHYSICAL REVIEW LETTERS | 1992年 / 69卷 / 23期
关键词：
D O I：
10.1103/PhysRevLett.69.3393
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Calculations of exciton radiative lifetimes in quantum wires free of defects are presented. Only excitons near zero wave number can spontaneously undergo radiative decay while conserving energy and momentum. The lifetime of the lowest-energy exciton in 100-angstrom-diam GaAs quantum wires, tau(spon) = 150 ps, is an order of magnitude longer than in quantum wells. This is due to the finite spatial coherence in the lateral direction. Thermalization effects lead to an effective lifetime of tau(T) = 140 square-root T ps K-1/2.
引用
收藏
页码：3393 / 3396
页数：4
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