RUI: Probing the Interplay between Magnetic Properties, Band Structure and Carrier Dynamics of III-V-based Magnetic Semiconductors

RUI：探讨 III-V 族磁性半导体的磁性、能带结构和载流子动力学之间的相互作用

• 批准号: 1207169
• 负责人: Frank Peiris
• 金额: $ 15万
• 依托单位: Kenyon College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-15 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1207169&HistoricalAwards=false
• 关键词: RUI; Probing; Interplay; between; Magnetic

Technical: This project is to study the interplay of electronic, optical and magnetic properties of III-V magnetic semiconductors via temperature-dependent spectroscopic ellipsometry (SE). While most other experiments probe a particular property of III-V magnetic systems, since SE is capable of detecting the electronic band structure of a material, the study is planning to uncover the interplay of various properties comprehensively. Although room-temperature based SE is widely used presently, that method is incapable of observing the interplay of III-V magnetic systems adequately, motivating this work to extend SE to cover a temperature range between 4K and 300K. This technique will specifically address the following issues related to III-V magnetic systems; how does exchange and hybridization interactions fine tune the magnetic coupling; what is the impact of the impurity bands in affecting magnetism and conductivity; and what is the significance of carrier-phonon dynamics in influencing the ferromagnetism? Additionally, the details of both the metal-to-insulator transition and the ferromagnetic to paramagnetic transition will be investigated thoroughly. Insights gained on these aspects will not only deepen our understanding of the fundamental physics of III-V magnetic semiconductors but also benefit applied scientists implementing spin-based electronics.Non-technical: This project will significantly advance scientific research, and research training among physics majors, which will subsequently influence students to pursue advanced degrees. This is by incorporating experiments related to optics into several physics courses, all physics majors will be introduced to these fields, resulting in the increase in talent and number of students entering the scientific and technical workforce. Also the work will have a strong impact on minority groups, particularly women, in light of the fairly high percentage of women majoring in physics at Kenyon. Engaging high school students on video-based mechanics experiments will expose them to the intimate connection between the realities outside and the theories learnt inside the classroom. The project will integrate various aspects of the proposed research into teaching by: (i) designing a seminar course related to magnetic semiconductors and spintronics; (ii) injecting four experiments into Optics and Advanced Lab courses related to classical optics and magneto-optics; (iii) developing an outreach program for high school students involving video-based mechanics experiments.

技术支持：本计画旨在利用温度相关椭圆偏振光谱法（SE）研究III-V族磁性半导体的电子、光学与磁性之间的相互影响。虽然大多数其他实验都是探测III-V磁性系统的特定性质，但由于SE能够检测材料的电子能带结构，因此该研究计划全面揭示各种性质的相互作用。虽然基于室温的SE目前被广泛使用，但该方法无法充分观察III-V族磁性系统的相互作用，促使这项工作将SE扩展到4K和300 K之间的温度范围。这项技术将具体解决以下问题有关的III-V族磁性系统;如何交换和杂交相互作用微调磁耦合;什么是影响磁性和导电性的杂质带的影响;以及什么是影响铁磁性的载流子声子动力学的意义？ 此外，金属到绝缘体的过渡和铁磁到顺磁过渡的细节将被彻底研究。通过这些方面的研究，不仅可以加深我们对III-V族磁性半导体的基础物理的理解，还可以帮助应用科学家实现基于自旋的电子学。非技术性：该项目将大大促进科学研究和物理专业的研究培训，从而影响学生攻读高级学位。这是通过将与光学相关的实验纳入几门物理课程，所有物理专业的学生都将被引入这些领域，从而增加了进入科学和技术劳动力的人才和学生人数。此外，这项工作将对少数群体，特别是妇女产生重大影响，因为凯尼恩大学物理专业的妇女比例相当高。让高中生参与基于视频的力学实验将使他们接触到外部现实与课堂内所学理论之间的密切联系。该项目将通过以下方式将拟议研究的各个方面融入教学：（i）设计与磁性半导体和自旋电子学相关的研讨会课程;（ii）将四个实验注入与经典光学和磁光学相关的光学和高级实验室课程;（iii）为高中生开发一个涉及视频力学实验的推广计划。