Optical Control of Electron Spins in Hybrid Quantum Structures of Diluted Magnetic Semiconductors

稀磁半导体混合量子结构中电子自旋的光学控制

• 批准号: 17340090
• 负责人: OKA Yasuo
• 金额: $ 5.18万
• 依托单位: Tohoku University
• 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 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340090/
• 关键词: spin dynamics; semiconductors; magnetic semiconductors; hybrid nanostructures; photoluminescence; magnetic materials

The objective of the research program is following:1.Designing and fabrication of new hybrid nanostructures composed of II-VI compound diluted magnetic semiconductors and magnetic metals.2.Study of optical spin injection and spin relaxation in the hybrid nanostructures of quantum dots and quantum wells for the application on spin electronic devices.We have fabricated, for the above objectives, the quantum structures and hybrid nanostructures with CdTe,CdSe,ZnTe,ZnSe and magnetic materials of Mn and Co by using molecular expitaxy and electron beam lithography. Fabricated quantum nanostructures are studied by femtosecond laser spectroscopy by applying high magnetic fields. Spin injection processes of electrons, holes and excitons are investigated in the quantum wells and quantum dots of ZnMnSe-ZnSe,CdMnSe-CdSe and CdMnTe-CdTe systems. Transient photoluminescence of excitons shows fast spin injection and spin relaxation processes in the quantum structures induced by the magnetic field. Ultrafast spin dynamics of carriers is investigated in the diluted magnetic double quantum wells by transient pump-probe spectroscopy. The spin injection dynamics of electrons and holes are clarified in femtosecond time domain. Hybrid nanostructures with the diluted magnetic semiconductors and the magnetic metals were fabricated by electron beam lithography technique. The diluted magnetic quantum disks in the hybrid structures show the Zeeman splitting without applying external magnetic field, which verifies the affection the ferromagnetic nano-scale magnets neighboring to the quantum disks. The obtained results in the present research have high possibilities for spin electronic applications.

该研究项目的目标如下：1.设计和制备由II-VI化合物稀磁半导体和磁性金属组成的新型混合纳米结构。2.研究量子点和量子阱混合纳米结构中的光学自旋注入和自旋弛豫，以应用于自旋电子器件。针对上述目标，我们制备了量子结构和混合纳米结构。 采用分子外延和电子束光刻技术，以 CdTe、CdSe、ZnTe、ZnSe 和 Mn、Co 磁性材料为材料。通过施加高磁场，通过飞秒激光光谱研究制造的量子纳米结构。研究了ZnMnSe-ZnSe、CdMnSe-CdSe和CdMnTe-CdTe体系的量子阱和量子点中电子、空穴和激子的自旋注入过程。激子的瞬态光致发光显示了磁场引起的量子结构中的快速自旋注入和自旋弛豫过程。通过瞬态泵浦探针光谱研究了稀磁双量子阱中载流子的超快自旋动力学。电子和空穴的自旋注入动力学在飞秒时域中得到阐明。通过电子束光刻技术制备了稀释磁性半导体和磁性金属的混合纳米结构。混合结构中的稀释磁性量子盘在不施加外部磁场的情况下表现出塞曼分裂，这验证了与量子盘相邻的铁磁纳米级磁体的影响。本研究取得的成果对于自旋电子学应用具有很大的可能性。

项目成果

Density-dependent dynamics of exciton magnetic polarons in ZnMnSe/ZnSSe type-II quantum wells

ZnMnSe/ZnSSe II 型量子阱中激子磁极化子的密度依赖动力学

• 发表时间: 2006
• 期刊: Phys. Rev. B 73・24
• 作者: Atsuko Kibayashi;Nobu Katayama;樹林 敦子;A.Murayama;A.Murayama;A.A.Toropov
• 通讯作者: A.A.Toropov

Spin-injection dynamics in a magnetic double quantum well studied by pump-probe absorption spectroscopy

通过泵浦探针吸收光谱研究磁性双量子阱中的自旋注入动力学

• 发表时间: 2006
• 期刊: Appl. Phys. Lett. 88・21
• 作者: Atsuko Kibayashi;Nobu Katayama;樹林 敦子;A.Murayama;A.Murayama;A.A.Toropov;K.Nishibayashi
• 通讯作者: K.Nishibayashi

Dynamical spin separation induced by spin-dependent type-II band alignment in a diluted magnetic double quantum well

稀释磁性双量子阱中自旋相关的 II 型能带排列诱导的动态自旋分离

• 发表时间: 2006
• 期刊: Appl. Phys. Lett. 88・21
• 作者: Atsuko Kibayashi;Nobu Katayama;樹林 敦子;A.Murayama;A.Murayama;A.A.Toropov;K.Nishibayashi;T.Koyama
• 通讯作者: T.Koyama

Spin dynamics in a diluted magnetic semiconductor quantum well studied by pump-probe absorption spectroscopy: Magnetic-field-induced suppression of electron-spin relaxation

• DOI: 10.1063/1.2216111
• 发表时间: 2006-06
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: A. Murayama;K. Seo;K. Nishibayashi;I. Souma;Y. Oka

Nanoscale magnet for semiconductor spintronics

用于半导体自旋电子学的纳米级磁体

• 发表时间: 2006
• 期刊: Appl. Phys. Lett. 88・12
• 作者: Atsuko Kibayashi;Nobu Katayama;樹林 敦子;A.Murayama
• 通讯作者: A.Murayama