Optical Properties of InP Self-Assembled Quantum Dots Studied by Imaging and Single Dot Spectroscopy
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概要
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Optical properties of single InP quantum dots (QDs) were investigated by means of micro-photoluminescence ($\mu$-PL) spectroscopy. The temperature dependence of the integrated $\mu$-PL intensity revealed that each QD has different thermal activation energy ranging from 5 to 40 meV. The PL intensities of some QDs recovered when the temperature was raised beyond a certain value. This phenomenon was explained by competition between radiative and nonradiative processes. In this work, the mechanism of fluorescence intermittency was also investigated. It was found that the switching is triggered by a photo-induced process and that the confined excitons in the excited states play an important role. From the observation of the $\mu$-PL spectra in the external electric field and their temperature dependence, we concluded that the large intensity change is caused by a local electric field generated by a carrier trapped at a localized center. These results indicate that the optical properties of the zero-dimensional system are strongly influenced by the local environment surrounding the QDs.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 2002-02-28
著者
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NISHI Kenichi
Single Quantum Dot Project, ERATO, JST, Tsukuba Research Consortium
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Ren Hong-wen
Single Quantum Dot Project Erato Jst Tsukuba Research Consortium:applied Optelectronics Incorporatio
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Masumoto Yasuaki
Single Quantum Dot Project Erato Japan Science And Technology Corporation:institute Of Physics Unive
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Sugisaki Mitsuru
Single Quantum Dot Project Erato Jst Tsukuba Research Consortium:energenius Centre For Advanced Nano
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Ren Hong-Wen
Single Quantum Dot Project, ERATO, JST, Tsukuba Research Consortium, 5-9-9 Tokodai, Tsukuba, Ibaraki 300-2635, Japan
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Sugisaki Mitsuru
Single Quantum Dot Project, ERATO, JST, Tsukuba Research Consortium, 5-9-9 Tokodai, Tsukuba, Ibaraki 300-2635, Japan
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Masumoto Yasuaki
Single Quantum Dot Project, ERATO, JST, Tsukuba Research Consortium, 5-9-9 Tokodai, Tsukuba, Ibaraki 300-2635, Japan
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