Raman, Brillouin, Infrared and Modulation Spectroscopy of Collective and Localized Excitations in Tetrahedrally Coordinated Semiconductors

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: 9800858
• 负责人: Anant Ramdas
• 金额: $ 33万
• 依托单位: Purdue Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9800858&HistoricalAwards=false
• 关键词: Raman; Brillouin; Infrared; Modulation; Spectroscopy

9800858Ramdas This research by Professors A.K. Ramdas and S. Rodriguez of the Department of Physics of Purdue University is focused on the investigation of novel spectroscopic phenomena exhibited by a range of tetrahedrally coordinated semiconductors which share common features in their atomic architecture, lattice dynamics, and electronic band structures. A rich program of investigations will be pursued, including the study of the nature of the electronic states of donor-bound electrons and acceptor-bound holes in isotopically controlled diamonds, in silicon carbide polytypes, and in II-VI compound semiconductors by Fourier transform infrared (FTIR), Raman, and photoluminescence spectroscopy. Also piezo- and magneto-spectroscopy will be used to deduce the site symmetry of the impurity, and the degeneracies, deformation potential constants, and g-factors characteristic of its bound states. Further, localized vibrational and gap modes of isoelectronic and compensated impurities in II-VIs, I-III-VI2, and II-IV-V2 chalcopyrites will be studied by FTIR as are the sp-d and d-d exchange interactions as revealed in the magnetic excitations in the II-VI and chalcopyrite based diluted magnetic semiconductors. These and other phenomena and systems constitute a wide ranging research program whose contributions to various areas of contemporary solid state physics and materials science will aid in our understanding of the fundamental behavior of novel materials and assist in their incorporation in varied technological devices. %%% This research by Professors A.K. Ramdas and S. Rodriguez of the Department of Physics of Purdue University is focused on the investigation of novel spectroscopic phenomena exhibited by a range of tetrahedrally coordinated semiconductors which share common features in their atom ic architecture, lattice dynamics, and electronic band structures. A rich program of investigations will be pursued, including the study of the nature of the electronic states of donor-bound electrons and acceptor-bound holes in isotopically controlled diamonds, in silicon carbide polytypes, and in II-VI compound semiconductors by Fourier transform infrared (FTIR), Raman, and photoluminescence spectroscopy. Also piezo- and magneto-spectroscopy will be used to deduce the site symmetry of the impurity, and the degeneracies, deformation potential constants, and g-factors characteristic of its bound states. Further, localized vibrational and gap modes of isoelectronic and compensated impurities in II-VIs, I-III-VI2, and II-IV-V2 chalcopyrites will be studied by FTIR as are the sp-d and d-d exchange interactions as revealed in the magnetic excitations in the II-VI and chalcopyrite based diluted magnetic semiconductors. These and other phenomena and systems constitute a wide ranging research program whose contributions to various areas of contemporary solid state physics and materials science will aid in our understanding of the fundamental behavior of novel materials and assist in their incorporation in varied technological devices. The research is conducted jointly with graduate students and post doctoral research associates. This collaboration serves to train the next generation of scientists and engineers ***

9800858RAMDAS A.K.教授的研究普渡大学物理学系的Ramdas和S. Rodriguez专注于对一系列四面体配位的半导体展示的新型光谱现象的研究，这些现象在其原子建筑，Lattice动力学和电子带结构中具有共同的特征。 将进行一项丰富的调查计划，包括研究供体结合电子的电子状态和同位素控制的钻石中的受体结合的孔，碳化硅多型中的钻石和II-VI化合物半导体中的傅立叶变换红外红外红外线。 （FTIR），拉曼和光致发光光谱。 同样，压电和磁光谱也将用于推断杂质的位点对称性，以及其结合态的脱生，变形电位常数和G因子的特征。 此外，FTIR将研究II-VIS，I-IIII-VI2和II-IV-V2 CHALCOPYRITES中等质和补偿杂质的局部振动和差距模式，而SP-D和D-D交换相互作用也将被FTIR研究基于II-VI和基于金黄铜矿的稀释磁性半导体中的激发。 这些和其他现象和系统构成了广泛的研究计划，其对当代固态物理和材料科学领域的贡献将有助于我们理解新型材料的基本行为，并协助将其纳入各种技术设备。 %% %%教授A.K.普渡大学物理学系的Ramdas和S. Rodriguez专注于对新型光谱现象的调查，这些现象是由一系列四面体配位半导体所展示的，这些半导体在其原子IC建筑，Lattice Dynamics和Electric频段结构中具有共同的特征。 将进行一项丰富的调查计划，包括研究供体结合电子的电子状态和同位素控制的钻石中的受体结合的孔，碳化硅多型中的钻石和II-VI化合物半导体中的傅立叶变换红外红外红外线。 （FTIR），拉曼和光致发光光谱。 同样，压电和磁光谱也将用于推断杂质的位点对称性，以及其结合态的脱生，变形电位常数和G因子的特征。 此外，FTIR将研究II-VIS，I-IIII-VI2和II-IV-V2 CHALCOPYRITES中等质和补偿杂质的局部振动和差距模式，而SP-D和D-D交换相互作用也将被FTIR研究基于II-VI和基于金黄铜矿的稀释磁性半导体中的激发。 这些和其他现象和系统构成了广泛的研究计划，其对当代固态物理和材料科学领域的贡献将有助于我们理解新型材料的基本行为，并协助将其纳入各种技术设备。 该研究与研究生和博士后研究助理共同进行。 这项合作有助于培训下一代科学家和工程师***