Momentum redistribution times of resonantly photogenerated 2D excitons

被引：19

作者：

Duer, R ^{[1
]}

Shtrichman, I ^{[1
]}

Gershoni, D ^{[1
]}

Ehrenfreund, E ^{[1
]}

机构：

[1] TECHNION ISRAEL INST TECHNOL,INST SOLID STATE,IL-32000 HAIFA,ISRAEL

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.78.3919

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We apply a novel transient interband-pump intersubband-probe technique to directly measure the time it takes for resonantly photoexcited excitons in GaAs/AlGaAs quantum well structures to redistribute in momentum space. The redistribution time and its excitation density dependence are determined from the temporal evolution of the conduction intersubband absorption spectrum, which is an unambiguous measure of the electrons phase space distribution. We find that resonantly excited heavy-hole excitons redistribute and reach thermal distribution at a slow rate nearly proportional to their density. This is due to the inefficient exciton-exciton scattering, and the small momentum that resonantly excited excitons carry.

引用

页码：3919 / 3922

页数：4

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