Optical spectra of nitride quantum dots: Quantum confinement and electron-hole coupling

被引：17
作者：
Hohenester, U [1 ]
Di Felice, R
Molinari, E
Rossi, F
机构：
[1] Univ Modena, Ist Nazl Fis Mat, Dipartimento Fis, I-41100 Modena, Italy
[2] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy
[3] INFM, I-10129 Turin, Italy
来源：
APPLIED PHYSICS LETTERS | 1999年 / 75卷 / 22期
关键词：
D O I：
10.1063/1.125292
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We calculate the optical properties of nitride-based quantum dots by taking into account quantum confinement as well as electron-hole interaction. We analyze model structures simulating In(x)Ga(1-x)N dots in In(y)Ga(1-y)N layers with different alloy compositions. We discuss the trends with the dot size and show that quantum confined excitations exist for a broad range of sizes down to the smallest observed dots. Our results allow us to identify the strong role of Coulomb correlations in the optical spectra and to predict a strong influence of photoexcitation power on selection rules in polarized samples. The signature of quantum confinement can be utilized for a critical interpretation of measured optical spectra. (C) 1999 American Institute of Physics. [S0003-6951(99)03448-8].
引用
收藏
页码：3449 / 3451
页数：3
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