Optical Properties of Spin Controlled Semiconductor Nanostructures

自旋控制半导体纳米结构的光学性质

• 批准号: 09244106
• 负责人: TAKEYAMA Shojiro
• 金额: $ 68.67万
• 依托单位: Chiba University (1999-2000)Himeji Institute of Technology (1997-1998)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09244106/
• 关键词: Diluted magnetic semiconductor; Magnetic polaron; spin; Magnetic semiconductor quantum dot; Superconductor; diluted magnetic semiconductor hybrid structure; Optical waveguide; Photoemission spectroscopy; Spin relaxation; 界面磁化; 励起子磁気ポーロラン; 量子ドット

Attempting to realize a breakthrough in the conventional devise concept of semiconductor engineering based on utilization of electrical charge, we set our aim of the study as to find the basic law and to cultivate its techniques of controlling spin degree of freedom in the electron of semiconductor nano-stuructures for spin controlled devices. Based on spectroscopic methods, systematic understanding of the relationship between the angular momentum of photons and the spins of conductive electrons and localized electrons are necessary for realization of the new spin controlled opto-functional devices. Thu summary of the research results are :1. It has been found that stable exciton magnetic polarons are formed in bulk dilute magnetic semiconductors. Polaron formation mechanism and relaxation dynamics have been clarified by the transient spectroscopy. Asymmetric exciton magnetic polaron states have been studied by photoluminescence and transient spectroscopic measurements in asymmetric di … More lute magnetic semiconductor quantum well. (Takeyama et al.)2. Self-organized quantum dot of CdTe, MnTe, and (Cd, Mn) Te with nano-size and good quality have been successfully synthesized by molecular beam epitaxy. Room temperature exciton observation in CdTe dots, anomalous shortening of emission life-time of intra Mn transition, enhancement of magnetic polaron effects in (Cd, Mn) Te dots have been reported. (Kuroda, Takita et al.)3. New type of II-V dilute magnetic semiconductor alloys with Cr or Ni has been synthesized by ion implantation techniques. (Ga, Cr) As alloys have been successfully synthesized as a new III-V dilute magnetic semiconductor by mplecular beam epitaxy. Magnetic circular dichroism spectroscopy was used to investigate p-d exchange and giant Zeeman effect. Also optical waveguide structures have been devised by constructing a double layer (Cd, Mn)Te structure on GaAs substrates. (Ando et al.)4. The electronic structure of magnetic semiconductor (Ga, Mn) As has been investigated by a photoemission spectroscopy with a help of cluster model. The origin of the conducting carriers and the coupling between the carrier spin and the Mn spin, which constitutes the basic information necessary to elucidate the mechanism of the ferromagnetism and the giant magneto-resistance observed in these materials, has been clarified. (Fujimori et al.)5. Far-infrared photoconductivity measurement on (Ga, Mn) As has been performed. A narrow hopping type conducting band near the Fermi surface has been found and also the correlation of the narrow band with the origin of ferromagnetism in this material has been suggested. (Hirakawa et al.) Less

为了实现半导体工程中基于电荷利用的传统设计理念的突破，我们将研究目标定为寻找半导体纳米结构中电子自旋自由度控制的基本规律和培育其技术，以实现自旋控制器件。基于光谱学方法，系统地理解光子角动量与导电电子和定域电子自旋之间的关系，对于实现新型自旋控制光功能器件是必要的。本文的研究成果总结如下：1.研究发现，在体相稀磁半导体中可以形成稳定的激子磁极化子。通过瞬态谱研究了极化子的形成机制和弛豫动力学。用光致发光和瞬态光谱方法研究了非对称双折射晶体中的非对称激子磁极化子态 ...更多信息 硬磁半导体量子阱（Takeyama等人）2.利用分子束外延技术成功地合成了CdTe、MnTe和（Cd，Mn）Te的纳米级自组织量子点。报道了CdTe量子点中的室温激子观测、Mn内跃迁发射寿命的异常缩短、（Cd，Mn）Te量子点中磁极化子效应的增强等。（黑田，Takita等人）3.用离子注入技术合成了含Cr或Ni的新型II-V族稀磁半导体合金。(Ga用分子束外延技术成功地合成了一种新的III-V族稀磁半导体合金。用磁性圆二色光谱研究了p-d交换和巨塞曼效应。还通过在GaAs衬底上构造双层（Cd，Mn）Te结构设计了光波导结构。(Ando等）。4.本文用团簇模型的光电子能谱研究了磁性半导体（Ga，Mn）As的电子结构。导电载流子的起源和载流子自旋与Mn自旋之间的耦合，构成了阐明这些材料中观察到的铁磁性和巨磁电阻机制所必需的基本信息，已被澄清。（Fujimori等人）5.对（Ga，Mn）As的远红外光电导进行了测量。在费米面附近发现了一个窄的跳跃型导带，并提出了该导带与材料铁磁性起源的关系。（Hirakawa等人）少

项目成果

S.Adachi: "Optical sampling four-wave-mixing experiments in liquid and solid materials"1999 Internationa Conference on Luminescence and Optical Spectroscopy of Condensed Matter, (PB2-34). (1999)

S.Adachi：“液体和固体材料中的光学采样四波混合实验”1999 年国际凝聚态发光和光学光谱会议，(PB2-34)。

H.Yokoi: "High Magnetic Field Photoluminescence Study of Pressure Effect on Spin Exchange Interaction in a CdTe/Cd1-xMnxTe Single Quantum Well"Rev.High Pressure Sci.Technol.. 7. 766-768 (1998)

H.Yokoi：“CdTe/Cd1-xMnxTe 单量子阱中压力对自旋交换相互作用影响的强磁场光致发光研究”Rev.高压科学技术.. 7. 766-768 (1998)

S.Takeyama: "Exciton magnetic polaron localization dynamics in bulk Cd1-xMnxTe"J.of Crys.Growth. 184-185. 917-920 (1998)

S.Takeyama：“块状 Cd1-xMnxTe 中的激子磁极化子局域化动力学”J.of Crys.Growth。

Y.Terai: "Magneto-photoluminescence from self-organized quantum dots of Cd1-xMnxTe grown by molecular beam epitaxy"J.Lumin.. 87-89. 396-398 (1999)

Y.Terai：“通过分子束外延生长的 Cd1-xMnxTe 自组织量子点的磁光致发光”J.Lumin.. 87-89。

S.Adachi: "Exciton spin dynamics in GaAs quantum wells"J.of Lumines.. 72-74. 72-74 (1997)

S.Adachi：“GaAs 量子阱中的激子自旋动力学”J.of Lumines.. 72-74。