Optical transitions in artificial few-electron atoms strongly confined inside ZnO nanocrystals

被引:67
作者
Germeau, A
Roest, AL
Vanmaekelbergh, D
Allan, G
Delerue, C
Meulenkamp, EA
机构
[1] Univ Utrecht, Debye Inst, NL-3508 TA Utrecht, Netherlands
[2] CNRS, UMR 8520, Inst Electron & Microelectron, Dept ISEN, F-59046 Lille, France
[3] Philips Res Labs, NL-5656 AA Eindhoven, Netherlands
关键词
D O I
10.1103/PhysRevLett.90.097401
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We have studied the optical transitions in artificial atoms consisting of one to ten electrons occupying the conduction levels in ZnO nanocrystals. We analyzed near IR absorption spectra of assemblies of weakly coupled ZnO nanocrystals for a gradually increasing electron number and found four allowed dipole transitions with oscillator strengths in quantitative agreement with tight-binding theory. Furthermore, this spectroscopy provides the single-particle energy separation between the conduction levels of the ZnO quantum dots.
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页数:4
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