Direct and exchange Coulomb energies in CdSe/ZnSe quantum dots

被引：4
|
作者：
Graham, TCM [1 ]
Curran, A [1 ]
Tang, X [1 ]
Morrod, JK [1 ]
Prior, KA [1 ]
Warburton, RJ [1 ]
机构：
[1] Heriot Watt Univ, Sch Engn & Phys Sci, Edinburgh EH14 4AS, Midlothian, Scotland
来源：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2006年 / 243卷 / 04期
关键词：
D O I：
10.1002/pssb.200564654
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We have determined the direct and exchange electron-electron and electron-hole Coulomb energies in CdSe/ZnSe quantum dots. The experiments are based on single dot photoluminescence at low temperature. By controlling the charging with a vertical transistor structure and by applying a symmetry-breaking magnetic field, we show how we can determine all the Coulomb energies. The direct Coulomb energies are responsible for large, similar to 20 meV, red-shifts of the emission on charging. The exchange Coulomb energies lead to a very pronounced fine structure splitting, up to 2.6 meV, for the neutral exciton. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
引用
收藏
页码：782 / 786
页数：5
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