Polarization and wave-vector-dependent measurements by four-wave mixing in ZnO: valence-band ordering and biexcitons

被引：7

作者：

Adachi, S ^{[1
]}

机构：

[1] Hokkaido Univ, Dept Appl Phys, Kita Ku, Sapporo, Hokkaido 0608628, Japan

来源：

JOURNAL OF LUMINESCENCE | 2005年 / 112卷 / 1-4期

关键词：

exciton-polariton; band structure; biexciton; four-wave mixing;

D O I：

10.1016/j.jlumin.2004.09.073

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have investigated free excitons and biexcitons of bulk ZnO by time-integrated and spectrally resolved four-wave mixing (FWM). The polarization- and wave-vector-dependent FWM signals for A and B excitons demonstrate clearly that the valence-band ordering is A-Gamma(9), B-Gamma(7), and C-Gamma(7). Also, we gave qualitative explanation of the FWM signals induced by excitons and biexcitons in ZnO. For negative delay times, bound and unbound AB-biexcitons (A exciton-B exciton correlation), which have been considered to play a minor role in GaAs hetero structures, was found to play an important role and give a significant qualitative impact to the optical response of ZnO. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：34 / 39

页数：6

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