稀磁半导体低维结构的自旋调控及器件应用

申请人已在青年科学基金项目支持的稀磁半导体(DMS)及相关领域开展了系统工作，取得了若干有创新性的研究成果。两年多来发表论文8篇，包括JACS、Small、OE、JPD各一篇和APL两篇，论文已他引22次。主要发展了ZnO DMS的微结构电子谱像检测技术，首先将二次电子诱发的电子能量损失特征应用于单个DMS纳米颗粒的电子结构精细研究，实现了纳米空间分辨和近光学能量分辨的掺杂剂能级观察；并结合第一性原理计算，直接从电子结构角度提出了能带耦合的室温磁性机制。.本项目将继续沿着青年科学基金项目的初步结果，发展制备高质量(Zn,Co)O一维纳米结构的可控化学生长和二维薄膜结构的激光分子束外延生长技术，通过外场调控，研究自旋输运、电荷转移、自旋轨道耦合及退相干等方面的量子物理特性，同时发展相关原型器件的制备工艺和技术，深入开展(Zn,Co)O低维结构的自旋调控及潜在的自旋电子学器件应用的实验研究。

The applicant has carried out the systematic work in the field of dilute magnetic semiconductors (DMS) as supported by Youth Scientific Fund (YSF) Project, and obtained several creative results. The applicant has published 8 papers in the Journals such as JACS, Small, OE, JPD, and APL, and gained 22-times citations by others. The applicant mainly developed electron beam image and spectroscopic examination technique applied to ZnO-based DMS microstructures. He firstly employed low-loss electron energy loss spectroscopy to study the electronic structures of individual DMS nanoparticles, achieved dopant energy level observation with the nanoscale spatial resolution and near optical energy resolution, and proposed band-coupling room-temperature magnetism directly from electronic structures based on the first-principles calculations..In this Project, the applicant will continue the preliminary results obtained from the YSF Project and develop the high-quality fabrication techniques for (Zn,Co)O DMS, i.e., the controlled chemical growth for one-dimensional nanostructures and laser molecular beam epitaxy growth for two-dimensional thin films. Through manipulation of the external fields, the applicant will study quantum physical characteristics, such as spin transport, charge transfer, spin-orbit coupling, and dephasing. At the same time, the applicant will develop the related prototype device fabrication procedure and technology, and conduct the in-depth experimental study on the spin manipulation in (Zn,Co)O low-dimensional structures and their potential applications in spintronic devices.