权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study of the persistent spectral hole burning memory made by semiconductor nanocrystals

半导体纳米晶持久光谱烧孔存储器的研究

基本信息

批准号：
10554011
负责人：
MASUMOTO Yasuaki
金额：
$ 8.13万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10554011/
关键词：
quantum dot confined acoustic phonon size effect photostimulated luminescence photon echo persistent hole burning two-level system CuCl ニ準位系 CuBr 銅イオントラップトラップ Fセンター

项目摘要

Size-confinement effect of acoustic phonon in CuCl quantum dots embedded in glass, NaCl crystal and KCl crystal was extensively studied by utilizing persistent spectral burning as size-selective spectroscopy. The observed size-confined acoustic phonon energies were compared with energies of acoustic phonon modes confined in elastic spheres.Photostimulated luminescence was observed for the first time in CuCl quantum dots embedded in NaCl crystal. The thermal quenching, spontaneous decay and excitation-fluence dependence of the photostimulated luminescence were almost the same as those of persistent spectral hole burning, indicating that the photoionization of quantum dots and the subsequent carrier capture at the traps near the quantum dots bring forth both the photostimulated luminescence and the persistent spectral hole burning. The traps are considered to be CuィイD1+ィエD1 in NaCl which acts as electron or hole traps.Accumulated photon echo from CuCl and CuBr quantum dots was extensively investigated at low temperatures up to 0.5 K. The experimental results gave us systematic knowledge on the temperature dependent homogeneous linewidth of excitons in quantum dots. At very low temperatures, the most dominant dephasing mechanism is the interaction of the quantum dots with the two-level system formed by quantum dots and their surrounding matrix.

利用持续光谱燃烧作为尺寸选择光谱，对玻璃、NaCl晶体和KCl晶体中CuCl量子点的声学声子尺寸限制效应进行了广泛的研究。将所观测到的尺寸限制的声学声子能量与弹性球中的声学声子模能量进行了比较，首次在NaCl晶体中的CuCl量子点中观测到了光致发光。光激发光的热猝灭、自发衰减和激发注量依赖性与持续光谱烧孔的性质基本相同，表明量子点的光电离和载流子在量子点附近陷阱的捕获同时产生了光激发光和持续光谱烧孔.在0.5K以下的低温下，研究了CuCl和CuBr量子点的累积光子回波.实验结果使我们对量子点中激子的均匀线宽随温度的变化有了系统的认识。在非常低的温度下，最主要的退相机制是量子点与由量子点及其周围基质形成的二能级系统的相互作用。