Imaging Spectroscopy of Exciton Spin Diffusion and Relaxation in Quantum Structure Semiconductors
量子结构半导体中激子自旋扩散和弛豫的成像光谱
基本信息
- 批准号:12640320
- 负责人:
- 金额:$ 2.5万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2000
- 资助国家:日本
- 起止时间:2000 至 2001
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In recent years, people have much interest on "spin electronics" such as spin transistors, where electronic spin plays more important role than its charge in semiconductors. Then knowledge of the spin relaxation and spin diffusion is one of keys for success. Nevertheless those physical mechanisms in quantum structures are not well known. Under this background, We studied the diffusion and relaxation of exciton spin in quantum well structures. For this purpose, we utilized the four-wave-mixing spectroscopy with spin grating. Two pump pulses generated the exciton density grating near the sample surface in the co-linear polarizations. For the cross-linear polarizations, the pump pulses cannot interfere and therefore uniform exciton density is created. But the mixture of up-spin and down-spin of exciton changes according to the spatial position and thus the spin grating can be created. The pitch of both density and spin gratings can adjust by the crossing angle between the pump pulses. The time-delayed probe pulse diffracted from those gratings gives the decay rate of the gratings that includes the information about the relaxation and diffusion of the spin and density according to the character of the created grating. So, we could measure the spin relaxation ; spin diffusion constant, recombination and density diffusion constant in the same system. In the result, we obtained that spin diffusion rate is 3.5-times larger than density diffusion. This result is for the first time under my knowledge.
近年来,人们对自旋晶体管等“自旋电子学”产生了浓厚的兴趣,在半导体中,电子自旋比其电荷更重要。因此,自旋弛豫和自旋扩散的知识是成功的关键之一。然而,量子结构中的这些物理机制并不为人所知。在此背景下,我们研究了量子阱结构中激子自旋的扩散和弛豫。为此,我们利用了四波混频光谱与自旋光栅。两个泵浦脉冲在样品表面附近产生共线偏振的激子密度光栅。对于交叉线性偏振,泵浦脉冲不能干涉,因此产生均匀的激子密度。但激子的上自旋和下自旋的混合随空间位置的变化而变化,从而可以产生自旋光栅。密度光栅和自旋光栅的间距可以通过泵浦脉冲之间的交叉角来调节。从这些光栅衍射的时间延迟的探测脉冲给出了光栅的衰减率,该衰减率包括根据所产生的光栅的特性的关于自旋和密度的弛豫和扩散的信息。因此,我们可以在同一个系统中测量自旋弛豫、自旋扩散常数、复合和密度扩散常数。结果表明,自旋扩散速率是密度扩散速率的3.5倍。这个结果是我第一次知道。
项目成果
期刊论文数量(41)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
S. Takeyama: "Photoexcited spin states in diluted magnetic semiconductor quantum structures"Physica B. 294/295. 453-458 (2001)
S. Takeyama:“稀释磁性半导体量子结构中的光激发自旋态”Physica B. 294/295。
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K. Hazu: "Optical nonlinearities and phase relaxation of excitons in GaN"Physical Review B (4/15 掲載予定). 65. (2002)
K. Hazu:“GaN 中激子的光学非线性和相位弛豫”物理评论 B(预定于 4/15 出版)。(2002 年)。
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S. Adachi: "Spin diffusion and relaxation measurements by optical sampling four wave mixing technique"Proceedings in Quantum Electronics and Laser Science Conference (Baltimore). 208 (2001)
S. Adachi:“通过光学采样四波混合技术进行自旋扩散和弛豫测量”量子电子和激光科学会议论文集(巴尔的摩)。
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H.Sasakura: "Quantum Computation using electron spins of alternate quantum dots in series"The 1st International Conference on Spintronics and Quantum Information Technology (SPINTECH, Hawaii). 39-39 (2001)
H.Sasakura:“使用串联交替量子点的电子自旋进行量子计算”第一届自旋电子学和量子信息技术国际会议(SPINTECH,夏威夷)。
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- 影响因子:0
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S.Adachi: "Dynamical spin properties iof exciton and biexciton in CdMnTe/CdTe/CdMgTe single quantum well"Physica E. to be published. (2001)
S.Adachi:“CdMnTe/CdTe/CdMgTe 单量子阱中激子和双激子的动态自旋特性”Physica E. 即将出版。
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ADACHI Satoru其他文献
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{{ truncateString('ADACHI Satoru', 18)}}的其他基金
Optical engineering of nuclear spins and localized spin manipulation
核自旋和局域自旋操纵的光学工程
- 批准号:
25247047 - 财政年份:2013
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Development of all-optical nano-probing and imaging techniques of nuclear spins in semiconductor nanostructures
半导体纳米结构中核自旋的全光学纳米探测和成像技术的发展
- 批准号:
22310063 - 财政年份:2010
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Electron spin transfer of single quantum dots by using teraheltz and/or laser lights
使用太赫兹和/或激光进行单量子点的电子自旋转移
- 批准号:
17310056 - 财政年份:2005
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Studies for estimation method of nonlinear optical crystals by using phonon imaging technique
声子成像技术非线性光学晶体估计方法的研究
- 批准号:
13554009 - 财政年份:2001
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
相似海外基金
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了解金属和氧化物中的自旋扩散长度
- 批准号:
1807124 - 财政年份:2018
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- 批准号:
0804243 - 财政年份:2008
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Continuing Grant
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- 批准号:
19615897 - 财政年份:2006
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$ 2.5万 - 项目类别:
Collaborative Research Centres
Spin diffusion of a spin-polarized two-dimensional electron system in semiconductor heterostructures
半导体异质结构中自旋极化二维电子系统的自旋扩散
- 批准号:
11640307 - 财政年份:1999
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Modelling of interfaces in charge transfer interacting polymer blends using spin diffusion data obtained ...; to support visit by C. Vasile, 'P. Poni' Inst. of Macromolecular Chem., Iasi, Romania
使用获得的自旋扩散数据对电荷转移相互作用聚合物共混物中的界面进行建模……;
- 批准号:
155783-1993 - 财政年份:1994
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$ 2.5万 - 项目类别:
Foreign Researcher Awards (H)