Imaging of electron spin density in coupled semiconductor nanostructures at^3 He temperatures

在 ^3 He 温度下耦合半导体纳米结构中的电子自旋密度成像

• 批准号: 17340093
• 负责人: NOMURA Shintaro
• 金额: $ 10.28万
• 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: 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/grant/KAKENHI-PROJECT-17340093/
• 关键词: quantum confinement; electron spin; near-field microscopy; ナノ構造; 近接場; 極低温; 強磁場; 量子ドット

One of the great advantages of semiconductor nanostructures is that the electronic states as well as spin states can be designed artificially. This enables us to prepare electronic states in semiconductor nanostructures which manifest novel physical properties. The purpose of this research is to detect novel correlated electronic sates in externally controllable semiconductor nanostructures. We have developed spatially resolved circularly-polarized spectroscopic system at low temperatures and at high magnetic fields. We have successfully developed a low temperature-high magnetic field-near field-scanning optical microscope operated at 70 mK. We have studied imaging of two dimensional electron system and quantum point contacts in high magnetic fields. We have obtained images of broad and narrow strips presumably reflect the diffusion of the optically created electrons in the bulk and the edge states in two dimensional electron system. We have determined of the electron and hole effective masses in perpendicular magnetic fields in the range between 1.5<r_s<6 by magneto-photoluminescence measurements. We find that the obtained effective masses increase with decrease in electron density. The oscillations of the photoluminescence peak energies are observed in quantum tubes depending on the magnetic flux through the tube. These oscillations in energies are shown to be due to the AB effect of a charged exciton in a quantum tube. Our research contributes to realize external control of novel correlated electronic sates in semiconductor nanostructures.

半导体纳米结构的最大优点之一是电子态和自旋态可以人为设计。这使我们能够在半导体纳米结构中制备电子态，表现出新的物理特性。本研究的目的是在外部可控制的半导体奈米结构中侦测新颖的相关电子态。我们研制了低温强磁场下空间分辨圆偏振光谱系统。我们成功地研制了一台工作温度为70 mK的低温强磁场近场扫描光学显微镜。我们研究了强磁场中二维电子系统和量子点接触的成像。我们得到了宽带和窄带的图像，这可能反映了光生电子在体电子中的扩散和二维电子系统的边缘态。本文用磁光致发光测量方法测定了在1.5<rs <6范围内垂直磁场中电子和空穴的有效质量。我们发现，所获得的有效质量的电子密度的减少而增加。在量子管中观察到光致发光峰能量的振荡依赖于通过管的磁通量。这些能量的振荡是由于量子管中带电激子的AB效应引起的。我们的研究有助于实现半导体纳米结构中新型关联电子态的外部控制。

项目成果

Magneto-optical properties of electron-hole states in GaAs quantum wires

GaAs量子线中电子空穴态的磁光特性

• 发表时间: 2008
• 期刊: J. Phys. 38
• 作者: H.;Tamura
• 通讯作者: Tamura

Photoluminescence measurements in Be-σ-doped back-gated quantum well

Be-σ 掺杂背栅量子阱中的光致发光测量

• 发表时间: 2005
• 期刊: Surface Science 583
• 作者: M.;Yamaguchi
• 通讯作者: Yamaguchi

Variation in time of charged and neutral excitons photoluminescence intensities in photo-irradiated GaAs quantum well

光照射GaAs量子阱中带电和中性激子光致发光强度随时间的变化

• 发表时间: 2008
• 作者: S.;Nomura;K. Matsuda;M. Yamaguchi;S. Nomura;S. Nomnura;M. Yamaguchi;S. Nomura;K.Matsuda;M.Yamaguchi;S.Nomura;S.Nomura;M.Yamaguchi;S.Nomura;S. Nomura;M. Yamaguchi;T. Akazaki;M. Yamaguchi;T. Itoh;M. Delbecq
• 通讯作者: M. Delbecq

Aharonov-Bohm oscillation of chargex exciton energy in quantum tubes

量子管中电荷激子能量的阿哈罗诺夫-玻姆振荡

• 发表时间: 2008
• 作者: 伊藤宙陛;野村晋太郎;N. Hayashi;S. Noinura
• 通讯作者: S. Noinura

Aharonov–Bohm Oscillations in Photoluminescence from Charged Exciton in Quantum Tubes

• DOI: 10.1143/jjap.46.l440
• 发表时间: 2007-04
• 期刊: Japanese Journal of Applied Physics
• 影响因子: 1.5
• 作者: K. Tsumura;S. Nomura;P. Mohan;J. Motohisa;T. Fukui