Thermodynamics of free trions in mixed type GaAs/AlAs quantum wells

被引:71
作者
Ron, A
Yoon, HW
Sturge, MD
Manassen, A
Cohen, E
Pfeiffer, LN
机构
[1] TECHNION ISRAEL INST TECHNOL,INST SOLID STATE,IL-32000 HAIFA,ISRAEL
[2] AT&T BELL LABS,MURRAY HILL,NJ 07974
关键词
quantum wells; semiconductors; electron-electron interactions; optical properties; luminescence;
D O I
10.1016/0038-1098(95)00758-X
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
An emission line which depends on the simultaneous presence of excitons and similar to 10(10) cm(-2) photoexcited electrons in a 20nm quantum well is shown to be due to free negatively charged excitons (''trions''). We have measured the temperature dependence of the exciton and trion lifetimes and of the exciton/trion ratio, and demonstrate that the trion is a free particle analogous to the negative positronium ion. The binding energy is 1.3 meV and the lifetime is 1/4 of that of the exciton. Both lifetimes increase with temperature, as expected for a free particle. The intensity of the trion line relative to the exciton line is a good measure of the electron density.
引用
收藏
页码:741 / 745
页数:5
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