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

非技术摘要拟议的研究利用一系列光学技术，以发现不断生产的新半导体的行为和性能的先进应用。高温/高功率器件基于宽禁带半导体，如金刚石和具有金刚石结构（SiC，ZnO，GaN等）;一类被称为“自旋电子化合物”的半导体材料与磁性成分;和材料获得与故意添加特定杂质的半导体将被研究。这些说明性的例子强调了半导体的兴奋和智力吸引力及其在消费电子，工业，空间和国防电子中日益增长的应用。该计划的研究生和博士后研究人员将通过接触尖端工作为研究生涯做好充分准备。在未来的几十年里，他们将成为学术界以及国家、工业和国防科学实验室未来的创造性成员。技术摘要该项目利用各种光谱和光学技术，探索四面体配位半导体及其异质纳米结构中的集体和局部激发（拉曼、布里渊、红外和调制光谱;磁光-法拉第、Voigt和塞曼效应）。 独特的签名II-VI稀磁半导体，同位素控制II-VI（ZnO和CdSe），III-V（GaN），IV-IV（SiC多型体）和元素（金刚石）将被探索和描绘的背景下，电子，磁性和振动激发及其行为下的外部扰动。 将研究异质结构和纳米结构中尺寸约束产生的新效应。 研究生和本科生（因“研究经验”而被选中）将获得应用于当代半导体物理前沿领域的最先进光谱学技能，并反过来成为科学/技术凝聚态社区的一部分，并对材料科学产生积极影响。

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.