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Spin-orbit coupling effects in spin manipulation and transport control

自旋操纵和输运控制中的自旋轨道耦合效应

基本信息

批准号：
17K05510
负责人：
サーリコスキヘンリー
金额：
$ 2.75万
依托单位：
Institute of Physical and Chemical Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2017
资助国家：
日本
起止时间：
2017-04-01 至 2019-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17K05510/
关键词：
spin spin-orbit rashba dresselhaus anisotropy interferometer InGaAs topology spinronics interference interferometry Rashba spintronics transport mesoscopic

项目摘要

The project achieved outstanding results in the field of spin interferometry. In the presence of both Rashba and Dresselhaus spin-orbit interaction transport through a spin-interferometer is anisotropic with respect to a probing in-plane magnetic field direction. We showed that this can be used to detect reversal of the sign of the Dresselhaus interaction. First, initial results were published discussing anisotropies in a fixed Dresselhaus interaction and variable Rashbaspin-orbit field. The results indicated oscillating anisotropy due to spinrotation dynamics on the Bloch sphere. The results have been published. Subsequently, we discussed experimental results in a InGaAs based spin-interferometer and compared results to numerical data at fixed Dresselhaus interaction. We found an extra transition in the sign of anisotropy that was consistent with reversal of the Dresselhaus spin-orbit interaction due to strain in the sample. Therefore the project achieved a remarkable goal as we showed that the spin-orbit fields canbe probed using spin interferometry and we were first to detect experimentally sign change of the Dresselhaus interaction. These results are under peer-review. We published also two other papers where we discuss topological transitions of the geometric phase in spin resonance. These results are analogous to those found in ring interferometers. The project was prematurely terminated due to loss of Kakenhi eligibility after the contract at the host institution ended. Therefore all the planned goals could not be achieved.

该项目在自旋干涉测量领域取得了突出的成果。在Rashba和Dresselhaus同时存在的情况下，自旋-轨道相互作用通过自旋干涉仪的输运相对于探测的面内磁场方向是各向异性的。我们证明了这可以用来检测Dresselhaus相互作用符号的反转。首先，发表了初步的结果，讨论了固定的Dresselhaus相互作用和可变的Rashbaspin轨道场中的各向异性。结果表明，布洛赫球上的自旋旋转动力学导致了振荡的各向异性。研究结果已经发表。随后，我们讨论了在InGaAs基自旋干涉仪上的实验结果，并将结果与固定Dresselhaus相互作用下的数值结果进行了比较。我们在各向异性符号中发现了一个额外的转变，这与由于样品中的应变而导致的Dresselhaus自旋-轨道相互作用的逆转是一致的。因此，该项目实现了一个显着的目标，因为我们证明了自旋-轨道场可以用自旋干涉法来探测，并且我们第一次实验检测到了Dresselhaus相互作用的符号变化。这些结果正在接受同行审查。我们还发表了另外两篇论文，讨论了自旋共振中几何相的拓扑相变。这些结果与在环形干涉仪中发现的结果相似。在主办机构的合同结束后，由于Kakeni资格的丧失，该项目被提前终止。因此，所有计划的目标都无法实现。