EXCITON SPIN RELAXATION IN THE 2D DENSE EXCITONIC PHASE - THE ROLE OF EXCHANGE INTERACTION

被引：15

作者：

BAYLAC, B ^{[1
]}

AMAND, T ^{[1
]}

BROUSSEAU, M ^{[1
]}

MARIE, X ^{[1
]}

DAREYS, B ^{[1
]}

BACQUET, G ^{[1
]}

BARRAU, J ^{[1
]}

PLANEL, R ^{[1
]}

机构：

[1] CNRS,MICROSTRUCT & MICROELECTR LAB,F-92225 BAGNEUX,FRANCE

来源：

SEMICONDUCTOR SCIENCE AND TECHNOLOGY | 1995年 / 10卷 / 03期

关键词：

D O I：

10.1088/0268-1242/10/3/010

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We have investigated the exciton luminescence and polarization dynamics in GaAs/AlGaAs quantum wells under resonant excitation at low temperature. Fast initial decays of both the luminescence intensity and the circular luminescence polarization are observed at high photogeneration density, typically for exciton areal densities above 2 x 10(10) cm(-2). These fast decays, which are not observed in a dense excitonic system with well defined angular momentum J(z) = +1 (or J(z) = -1), are simultaneously initiated by the increase of the ellipticity of the photogenerated excitons. We interpret these fast decays in terms of a very efficient angular momentum relaxation mechanism associated with exciton-exciton exchange interaction.

引用

页码：295 / 301

页数：7

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