U.S.-Brazil Cooperative Research: Study of the Electron-nuclear Spin Interaction in Semiconductor Systems: Towards Spintronic Memory Devices

在这项由国际科学与工程办公室美洲计划资助的美巴合作项目中，佛罗里达大学的Clifford R.Bowers将研究半导体系统中的电子-核自旋相互作用，并可能应用于自旋电子存储设备。特别是，他将研究包含低维电子气的抛物线量子阱中的核自旋弛豫时间。施加相对于量子阱平面倾斜的磁场改变了电子光谱，预计将对附近Al、Ga或As核的自旋弛豫时间产生显著影响。鲍尔斯的巴西合作者，圣保罗大学的古纳迪·M·古瑟夫和阿兰·A·奎维，将培育一种新型结构-抛物线量子井，用于监测电子-核自旋相互作用。鲍尔斯将使用电检测的ESR和动态核偏振光谱技术来表征这些半导体。从这些研究中获得的见解可能对基于自旋电子学的设备的开发至关重要。每个实验室的研究生将从另一个实验室学习新的实验技术，提供他们在本国机构无法接受的培训。该培训包括描述高频半导体器件和生长半导体材料的实际经验。

In this U.S.-Brazil collaborative project funded by the Americas Program of the Office of International Science and Engineering, Clifford R. Bowers of the University of Florida will study the electron-nuclear spin interaction in semiconductor systems with potential application to spintronic memory devices. In particular, he will study nuclear spin relaxation times in parabolic quantum wells containing a low dimensional electron gas. The application of a magnetic field tilted with respect to the plane of the quantum well alters the electronic spectrum in a way that is expected to have a marked impact on the spin relaxation time of nearby Al, Ga or As nuclei. Bowers' Brazilian collaborators, Guennadii M.Gusev and Alain A. Quivy of the University of Sao Paulo, will grow a novel type of structure, a parabolic quantum well, for monitoring the electron-nuclear spin interactions. Bowers will use electrically detected ESR and dynamic nuclear polarization spectroscopic techniques to characterize these semiconductors. Insights gained from these studies could be crucial for the development of spintronics-based devices. Graduate students from each laboratory will learn new experimental techniques from the other, providing training that they could not receive at their home institution. This training includes hands-on experience in characterizing semiconductor devices in high frequencies and growing semiconductor materials.