Electronic, Optical, and Vibrational Properties of IV - VI Semiconductor Nanocrystals

小行星9321259 技术摘要：半导体纳米晶体具有电子、空穴和激子的强量子限制特性。 半导体铅硫族化物的纳米晶体提供了进入强约束区的独特途径。 这些纳米晶体的电子结构，振动特性，以及电子和振动态的耦合将与拉曼和远红外光谱以及连续波，纳秒和飞秒光学技术进行研究。 这项研究将提供详细的信息库仑相互作用的重要性下的条件下，强约束的电荷载流子。 非技术摘要：将电子限制在原子尺寸量级的固体结构具有与相应的块状晶体截然不同的性质。 该项目的目标是确定由铅盐（如硫化铅）制成的纳米结构的电子和光学特性，其中限制的影响应该大于大多数其他材料。 铅盐的独特功能，预计将导致非线性光学性能比以前研究的纳米结构强约1000倍。 这种强光学非线性材料在光学信息处理方面具有潜在的应用前景。 ***

9321259 Wise Technical abstract: It is proposed to investigate the properties of semiconductor nanocrystals which exhibit strong quantum confinement of electrons, holes and excitons. Nanocrystals of the semiconducting lead chalcogenides provide unique access to the strong-confinement regime. The electronic structure, the vibrational properties, and the coupling of the electronic and vibrational states of these nanocrystals will be investigated with Raman and far-infrared spectroscopies as well as continuous wave, nanosecond and femtosecond optical techniques. This research will provide detailed information about the importance of Coulomb interactions under conditions of strong confinement of charge carriers. Non-technical abstract: Solid structures which confine electrons to dimensions on the order of atomic sized dimensions have properties which differ drastically from those of the corresponding bulk crystals. The goal of this project is to determine the electronic and optical properties of nanostructures made of the lead salts (such as lead sulfide), where the effects of confinement should be greater than in most other materials. The unique features of the lead salts are expected to lead to nonlinear optical properties approximately 1000 times stronger than those of previously investigated nanostructures. The potential applications of such strongly optically nonlinear materials is in optical information processing. ***