U.S.- Germany Cooperative Research: Electronic and Magnetic Excitations in II-VI Semiconductors and their Alloys

9981626Ramdas该奖项支持Anant K.Ramdas博士和普渡大学的一名研究生与德国拜罗伊特大学实验物理系的Harald Pascher合作。该合作研究了II-VI稀磁半导体的三元和四元合金中的集体和局域激发。实验研究包括自发拉曼散射和相干斯托克斯-拉曼研究，并辅之以调制技术、光致发光和傅里叶变换光谱。稀磁半导体中的磁相互作用由磁性离子的浓度或亚微米量子阱结构中的维度控制，在许多现象中以壮观的方式表现出来，如法拉第和福格特效应、拉曼电子顺磁共振和拉曼反铁磁共振。这一奖项为为期两年的奖项增加了第三年的研究，该奖项已经产生了重大成果，发表了几篇论文，并为几名普渡大学的研究生提供了出色的经验。

9981626RamdasThis award supports Dr. Anant K. Ramdas and a graduate student from Purdue University in a collaboration with Harald Pascher of the Department of Experimental Physics at the University of Bayreuth, Germany. The collaboration studies the collective and localized excitations in the ternary and quaternary alloys of II-VI diluted magnetic semiconductors. Experimental investigations involve spontaneous Raman scattering and coherent Stokes-Raman studies supplemented with modulation techniques, photoluminescence, and Fourier transform spectroscopy. Magnetic interactions in the diluted magnetic semiconductors, controlled by the concentration of the magnetic ions or by the dimensionality in sub-micron quantum well structures manifest themselves in a spectacular manner in numerous phenomena, such as the Faraday and Voigt effect, Raman-electron paramagnetic resonance, and Raman-anti-ferromagnetic resonance. This award adds a third year of research to a two-year award that has already produced significant results, several publications, and excellent experience for several Purdue graduate students.