Experimental Study of Many-Body Effects in Quantum Dots

量子点多体效应的实验研究

• 批准号: 17204023
• 负责人: KATSUMOTO Shingo
• 金额: $ 27.54万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17204023/
• 关键词: Quantum dot; Mesoscopic phenomena; Q?uantum computation; Tunneling phenomena; Few electron system; メゾスコピック系

Most important quantity obtained in coherent transport is the phase shift through the dots, which gives complementary information to the scattering amplitude (i.e., the conductance). However two-terminal devices have an essential difficulty called "phase rigidity" in obtaining the phase shift. There are two representative ways to avoid the problem : one is to adopt multi-terminal configuration and another is to use resonance in the interferometer. This article mainly reviews the latter approaches. Such resonance in the whole interferometer often joins with local resonance inside the interferometer and appears as the Fano effect, which is a powerful tool to investigate the phase shift problem with the aid of theories. In addition to such resonances of single-electron states, spin of electrons causes a kind of many-body resonance, that is, the Kondo effect. Combination of these resonances is the Fano-Kondo effect. Experiments on the Fano-Kondo effect, which unveil natures of the Kondo resonance, are also investigated.

在相干传输中获得的最重要的量是通过点的相移，其给出散射幅度的补充信息（即，电导）。然而，二端器件在获得相移时有一个基本的困难，称为“相位刚性”。有两种典型的解决方法：一种是采用多端结构，另一种是在干涉仪中使用谐振。本文主要对后者进行综述。整个干涉仪中的这种共振常常与干涉仪内部的局部共振结合起来，表现为Fano效应，它是借助理论研究相移问题的有力工具。除了这种单电子态的共振，电子的自旋引起一种多体共振，即近藤效应。这些共振的组合是Fano-Kondo效应。Fano-Kondo效应的实验，揭示了Kondo共振的性质，也进行了研究。

项目成果

Electrical coherent control of nuclear spins in a breakdown regime, of quantum Hall effect

量子霍尔效应击穿状态下核自旋的电相干控制

• 发表时间: 2007
• 期刊: Appl. Phys. Lett. 91
• 作者: H. Takahashi;M. Kawamura;S. Masubuchi;K. Hamaya;T. Machida;Y. Hashimoto;S. Katsumoto
• 通讯作者: S. Katsumoto

The Fano-Kondo effect in semiconductor quantum dots

半导体量子点中的法诺-近藤效应

• 发表时间: 2005
• 作者: D. Kosumi;et al.;S. Katsumoto
• 通讯作者: S. Katsumoto

Anisotropic Transport of Two-Dimensional Hole System in Higher Landau Levels:Effect of In-Plane Magnetic Field

高朗道能级二维空穴系统的各向异性输运：面内磁场的影响

• 发表时间: 2007
• 期刊: J. Phys. Soc. Jpn 76
• 作者: H. Takado;Y. Hashimoto;A. Endo;S. Katsumoto;Y. Iye
• 通讯作者: Y. Iye

電子フォーカシングを用いたバリスティック電子系におけるStern-Gerlach効果の観測

使用电子聚焦观察弹道电子系统中的斯特恩-格拉赫效应

• 发表时间: 2008
• 作者: Taishi Takenobu;et.al.;李 相潤
• 通讯作者: 李 相潤

Fano effect in a few-electron quantum dot

• DOI: 10.1143/jpsj.76.084706
• 发表时间: 2007-08-01
• 期刊: JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
• 影响因子: 1.7
• 作者: Otsuka, Tomohiro;Abe, Eisuke;Kang, Kicheon
• 通讯作者: Kang, Kicheon