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.

我们从理论上研究了限制在纳米晶体中的电子空穴系统的量子力学状态和动力学。主要结果如下：(1)我们建立了一种有效的方法来计算球形量子点中限制的电子空穴对态的几乎所有本征态。这使得可以计算每个总角动量的本征态，并成为研究对任意扰动的响应的数值方法的基础。(2)嵌入氯化钠晶体中的CuCl纳米晶体的瞬态吸收实验数据和2-光子吸收光谱。我们的理论进行了分析。测量与理论计算之间取得了良好的一致性。(3) 结合实际材料中观察到的持续烧孔，研究了位于量子点外部的点电荷的影响。(4) 电子空穴的本征态通过数值计算研究了限制在球形量子点表面的对。均匀磁场的影响也得到了阐明。(5)通过简单的二粒子束缚态模型研究了复合粒子的量子隧道效应。研究发现，即使在单一势垒的情况下，也可能发生共振隧道效应。

项目成果

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.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 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: "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 et.al.: "Excited state absorption of excitons confined in spherical quantum clots"Phys.Rev.B. 59. 9826-9829 (1999)

T.Uozumi 等人：“限制在球形量子凝块中的激子的激发态吸收”Phys.Rev.B。