Raman, Brillouin, Inrared and Modulation Spectroscopy of Collective and Localized Excitations in Tetrahedrally Coordinated Semiconductors & Their Heterostructures

四面体配位半导体中集体和局域激发的拉曼光谱、布里渊光谱、红外光谱和调制光谱

• 批准号: 0705793
• 负责人: Anant Ramdas
• 金额: --
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2013-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0705793&HistoricalAwards=false
• 关键词: Raman; Brillouin; Inrared; Modulation; Spectroscopy

Non-Technical AbstractThe proposed research exploits a range of optical techniques in order to discover the behavior and properties of new semiconductors constantly being produced for advanced applications. High temperature/high power devices based on wide gap semiconductors such as diamond and having diamond like structures (SiC,ZnO,GaN, etc); a class of semiconducting materials known as "spintronic compounds" with magnetic constituents; and materials obtained with deliberate addition of specific impurities to semiconductors will be studied. These illustrative examples underscore the excitement and the intellectual appeal of semiconductors and their ever increasing applications in consumer, industrial, space, and defense electronics. The graduate students and postdoctoral research associates with the program will be well prepared for research careers by this exposure to the cutting edge work. With the expertise thus acquired, they will become future creative members of the academia as well as national, industrial, and defense science laboratories in the coming decades.Technical AbstractThe project explores collective and localized excitations in tetrahedrally coordinated semiconductors and their hetero-nanostructures exploiting a variety of spectroscopic and optical techniques (Raman, Brillouin, Infrared and Modulation Spectroscopy; magneto-optics - Faraday, Voigt, and Zeeman effect). Signatures unique to the II-VI diluted magnetic semiconductors, isotopically controlled II-VI (ZnO and CdSe), III-V (GaN), IV-IV (SiC polytypes) and elemental (diamond) will be explored and delineated in the context of electronic, magnetic, and vibrational excitations and their behavior under external perturbations. Novel effects resulting from dimensional constraints in hetero-and nano-structures will be investigated. Graduate students and undergraduate students (selected for "research experience") will acquire skills in the state-of-the-art spectroscopy applied to forefront areas in contemporary semiconductor physics, and, in turn, become part of the scientific/technical condensed matter community and have a positively impact on materials science.

非技术摘要所提出的研究利用了一系列光学技术，以发现为先进应用而不断生产的新型半导体的行为和特性。基于金刚石等宽禁带半导体并具有类金刚石结构（SiC、ZnO、GaN等）的高温/高功率器件；一类被称为“自旋电子化合物”的半导体材料，具有磁性成分；将研究通过故意向半导体添加特定杂质而获得的材料。这些说明性的例子强调了半导体的令人兴奋和智力吸引力及其在消费、工业、太空和国防电子领域不断增长的应用。该项目的研究生和博士后研究员将通过接触前沿工作为研究生涯做好充分准备。凭借由此获得的专业知识，他们将在未来几十年内成为学术界以及国家、工业和国防科学实验室的未来创意成员。技术摘要该项目利用四面体配位半导体及其异质纳米结构探索集体和局部激发。各种光谱和光学技术（拉曼、布里渊、红外和调制光谱；磁光 - 法拉第、福伊特和塞曼效应）。 将在以下背景下探索和描述 II-VI 稀释磁性半导体、同位素控制的 II-VI（ZnO 和 CdSe）、III-V（GaN）、IV-IV（SiC 多型）和元素（金刚石）的独特特征。电子、磁和振动激发及其在外部扰动下的行为。 将研究异质结构和纳米结构的尺寸限制所产生的新效应。 研究生和本科生（根据“研究经验”选择）将获得应用于当代半导体物理学前沿领域的最先进的光谱学技能，进而成为科学/技术凝聚态物质社区的一部分并对材料科学产生积极影响。