FEW BODY PROBLEM IN NANOCRYSTALS

纳米晶体的身体问题很少

• 批准号: 11640323
• 负责人: KAYANUMA Yosuke
• 金额: $ 1.34万
• 依托单位: OSAKA PREFECTURE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640323/
• 关键词: quantum dot; quantum size effect; confinement of excited states; transient absorption spectrum; two-photon absorption; Hylleraas coordinates; excitons on a spherical surface; quantum tunneling; 励起子; 励起状態の閉じ込め; 2光子過程; 球表面の閉じ込め; 複合粒子のトンネル効果; 閉じ

We have investigated theoretically quantum mechanical states and dynamics of electron-hole systems confined in nanocrystals. The main results are as follows.(1) We have established an efficient method to calculate essentially all of the eigenstates of an electron-hole pair state confined in spherical quantum dots. This allows for calculation of eigenstates of every total angular momentum, and becomes a basis of numerical method to investigate responses to arbitrary perturbations.(2) The experimental data of transient absorption and the 2-phohton absorption spectra obtained for CuCl nanocrystals embedded in NaCl crystals are analyzed by our theory. Good agreements between the measurements and the theoretical calculations are obtained.(3) The effects of a point charge located outside of quantum dots are investigated in connection with the persistent hole burnings observed in real materials.(4) The eigenstates of an electron-hole pair confined to a surface of spherical quantum dots are investigated by numerical calculation. The effects of a uniform magnetic field are also clarified.(5) Quantum tunneling of a composite particle is investigated by a simple two-particle bound state model. It is found that resonant tunneling may occur even in the case of a single potential barrier.

我们已经研究了局限于纳米晶体的电子孔系统的理论上量子机械状态和动力学。主要结果如下。（1）我们建立了一种有效的方法来计算限制在球形量子点中的电子孔对状态的所有特征状态。这允许计算每种总角动量的本征状态，并成为研究对任意扰动的响应的数值方法的基础。（2）瞬时吸收的实验数据和2-Phohton吸收光谱获得的CUCL纳米晶体嵌入NACL晶体中的CUCL纳米晶体获得通过我们的理论分析。 （3）与实际材料中观察到的持续孔燃烧有关的量子点外部的点电荷的影响（4）通过数值计算研究了局限于球形量子点表面的对。还阐明了均匀磁场的效果。（5）通过简单的两粒子结合态模型研究了复合粒子的量子隧穿。发现即使在单一潜在屏障的情况下，也可能发生谐振隧道。

项目成果

T.Itoh et al.: "Photophysics of Confined Excitons in CuCl Nanoparticles - Confinement of Exciton Excited States"Proc.Int.Conf.Excitonic Processes in condens.Matter. (in press).

T.Itoh 等人：“CuCl 纳米颗粒中受限激子的光物理学 - 激子激发态的限制”Proc.Int.Conf.Condens.Matter 中的激子过程。

T.Uozumi et al.: "Excited state absorption of excitons confined in spherical quantum dots"Phys.Rev.. B59, No.15. 9826-9829 (1999)

T.Uozumi 等人：“限制在球形量子点中的激子的激发态吸收”Phys.Rev.. B59，No.15。

T.Uozumi and Y.Kayanuma: "Theory of Optical Responses of Spherical Quantum Dots under Static and Dynamical External Fields"Proc.Int.Conf.Excitonic Processes in Condensed Matter. (To be published.).

T.Uozumi 和 Y.Kayanuma：“静态和动态外部场下球形量子点的光学响应理论”Proc.Int.Conf.凝聚态物质中的激子过程。

T.Uozumi and Y.Kayanuma: "Theory of Optical Responses of Spherical Quantum Dots under Static and Dynamical External Fields"Proc.Int.Conf.Excitonic Processes in Condens.Matter. (in press).

T.Uozumi 和 Y.Kayanuma：“静态和动态外部场下球形量子点的光学响应理论”Proc.Int.Conf.Condens.Matter 中的激子过程。

T.Uozumi and Y.Kayanuma: "Higher Excited Electron Hole Pair States in Quantum Dots and Related Second Order Optical Processes"J.Luminescence. 87-89. 375-377 (2000)

T.Uozumi 和 Y.Kayanuma：“量子点中的更高激发电子空穴对状态和相关的二阶光学过程”J.Luminescent。