OFF-DIAGONAL DISORDER MODEL FOR EXCITON POLARITONS IN LAYERED MEDIA - DISORDER-INDUCED ORIGIN OF RADIATIVE WIDTHS

被引：3
|
作者：
CITRIN, DS
机构：
[1] Centre for Ultrafast Optical Science, The University of Michigan, Ann Arbor, MI 48109-2099
来源：
CHEMICAL PHYSICS LETTERS | 1994年 / 228卷 / 4-5期
关键词：
D O I：
10.1016/0009-2614(94)00952-X
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Excitons in an infinite layered dipolar medium, such as a layered molecular crystal or a multiple-quantum-well stack, with perfect periodicity exhibit a vanishing radiative width due to the requirement of energy-momentum conservation. Using a polariton model with off-diagonal disorder and a configuration-averaging technique, we show how deviations from the ideal case, specifically in the form of weak departures from perfect periodicity, and the resulting breaking of full translational invariance, give rise to a nonvanishing radiative width.
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页码：307 / 311
页数：5
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