Femtosecond Spin Dynamics in Magnetic Semiconductor Quantum Structures

小行星9500460 在由II-VI族稀磁半导体（DMS）制造的量子结构中，研究了降维量子限制对基本磁和电子自旋动力学的影响。 磁光光谱探测自旋相关的现象，如载流子自旋翻转散射，自旋相关的电子隧穿和本地化，磁极化子的形成，和自旋晶格弛豫过程。 该计划结合了飞秒光学测量，集成DCSQUID技术和外延材料制造的最新技术，以获得量子磁系统动态行为的实时视图。 % % % 该项目涉及磁性和半导体的非常小的粒子的光谱学。 颗粒的小尺寸以有趣的方式影响颗粒的电特性。 此外，粒子的电子性质受其磁性的影响。 这意味着半导体性质可以通过外部磁场来调节。 超快光学技术正在研究其电子性质. 最先进的材料和实验技术对基础物理学很有意义，并可能导致用于电子和磁性应用的新器件。 ***

9500460 Samarth The effects of reduced dimensionality a quantum confinement on fundamental magnetic and electronic spin dynamics are being investigated in quantum structures fabricated from II-VI diluted magnetic semiconductors (DMS). Magneto-optical spectroscopy probes spin-dependent phenomena such as carrier spin-flip scattering, spin dependent electronic tunneling and localization, magnetic polaron formation, and spin-lattice relaxation processes. The program combines state-of-the-art techniques in femtosecond optical measurements, integrated DCSQUID technology and epitaxial materials fabrication to obtain a real-timed view of dynamical behavior in quantum magnetic systems. % % % This project involves optical spectroscopy on very small particles that are both magnetic and semiconducting. The small size of the particles influences the electrical properties of the particles in interesting ways. In addition, the electronic properties of the particles are influenced by their magnetism. This means that the semiconducting properties can be tuned by an external magnetic fields. The electronic properties are being investigated by ultra- fast optical techniques. The state-of-the-art materials and experimental techniques are of interest for fundamental physics, and may lead to new devices for electronic and magnetic applications. ***