Excitonic and biexcitonic decoherence in self-assembled GaAs quantum dots as observed by phase-locked interferography

被引:28
|
作者
Kuroda, K
Kuroda, T [1 ]
Sakoda, K
Watanabe, K
Koguchi, N
Kido, G
机构
[1] Natl Inst Mat Sci, Nanomat Lab, Tsukuba, Ibaraki 3050044, Japan
[2] Univ Tsukuba, Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058577, Japan
关键词
D O I
10.1063/1.2187441
中图分类号
O59 [应用物理学];
学科分类号
摘要
We observe single-photon interferograms for emission of a single self-assembled GaAs quantum dot. A phase stabilizer is applied to the interferometer, enabling us to trace autocorrelations of weak emissions with a photon-counting level. At low excitation, where the average number of excitons in a dot is less than one, interferography reveals a single exponential decay, reflecting excitonic decoherence. At moderately high excitation, polarization interference between the exciton-biexciton transitions is found to appear on the interferogram. The decoherence time and the binding energy of biexcitons are determined simultaneously.
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页数:3
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