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Measurement of electron spin flip-flop time

电子自旋触发器时间的测量

基本信息

批准号：
59540202
负责人：
MURAMOTO Takao
金额：
$ 1.34万
依托单位：
Shiga University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-59540202/
关键词：
Cross relaxation time Flip-flop time Ruby Optical hole burning Homogeneous line width Optical labeling technique ブロッホ方程式

项目摘要

We have measured the flip-flop time of electron spins in the (+1/2)sublevels of the ground state <^4A_2> of <Cr^(3+)> in ruby. (Phys.Rev.B34.1972,'86) It is the first experiment in the world to measure directly the flip-flop time of a two-level elctron spin system. In this experiment, we used the method of optical labeling, which is proposed and examined by us in the same electron spin system. (Phys,Rev. B30 2983,'84) It is about 10 sec ( 0.05 wt% ) at the applied magnetic fields, higher than 500 Oe. It is longer than the reported value by A.Szabo obtained by indirect measurment. The cause of the difference has never been understood. We need much more precise measurements of concentration and magnetic field dependence. We also investigated the theoretical calculation of cross relaxation time in dilute spin system in solids.(Phys. Rev.B29.6043,'84) We porposed the time dependence of the spin flip-flop time, which will be proportional to <t^(-1/2)> .Theoretical and experimental investigation to show that Bloch equations to describe a two-level spin system are not always correct. In the saturation and the shape of homogeneous line broadening, differences between the experimental results and the theoretical anticipations become clear. (Optics Commun.51,163,'84) The cause of the differences is attributed to non-pure two level system. which is accompanied by many sublevels due to superhyperfyne interaction between surrounding paramagnetic nuclei. We have measured homogeneous line broad-ening of -components of <R_1> line in a dilute ruby at applied magnetic fileds and results are explained by the same idea reported above.

我们测量了红宝石中<Cr^（3+）>基态<^4A_2>的（+1/2）能级电子自旋的翻转时间。（Phys.Rev.B34.1972，'86）这是世界上第一个直接测量二能级电子自旋系统触发时间的实验。在本实验中，我们采用了我们提出并在同一电子自旋系统中检验的光学标记方法。(Phys在高于500 Oe的外加磁场下，它约为10秒（0.05wt%），比A.Szabo报道的间接测量值长。造成这种差异的原因从来没有被理解过。我们需要更精确地测量浓度和磁场依赖性。我们还研究了固体中稀自旋系统交叉弛豫时间的理论计算。（Phys.Rev.B29.6043，'84）我们提出了自旋翻转时间与<t^（-1/2）>成正比的关系，理论和实验研究表明，描述二能级自旋系统的Bloch方程并不总是正确的。在饱和度和均匀谱线展宽的形状方面，实验结果与理论预测的差异变得明显。（光学通讯51，163，'84）的差异的原因归因于非纯二能级系统。由于周围顺磁核之间的超超粒子相互作用，其伴随有许多子能级。我们测量<R_1>了稀红宝石在外加磁场下的谱线均匀加宽，并用上述同样的观点解释了结果。