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

来源：

APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 12期

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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