Theory of Electrons in Solids

固体中的电子理论-半导体异质结构的电子性质，包括能量和自旋弛豫，将作为结构形成对电子的限制函数和作为电子之间相互作用的函数以及与其他激发的函数来研究。具体的研究系统是III-V和硅/锗复合材料的邻近平面量子阱上的侧向超晶格和p型量子井。这些系统中的光学性质的理论将被研究并用于预测和理解观察到的光学现象。特别是，具有特定偏振的光谱的时间演化将在皮秒尺度上被研究。对电子相互作用的研究也将扩展到具有窄电子能带的固体。半导体异质结是至少具有一个非常小尺寸的层状复合结构。这种结构正在被广泛地研究应用，特别是作为光电子器件。这个项目将研究这些应用的核心问题，包括微小尺寸对能量和自旋松弛的影响。我们将考察这类人工构造材料的静态和动态光学性质。这些研究旨在了解异质结构设计对所需特性的内在影响，包括光学频率范围、带宽和超净器件的灵敏度。

Theory of Electrons in Solids - Electronic properties of semiconductor heterostructures, including energy and spin relaxation, will be studied as functions of confinement of the electrons by the structural formation and as functions of electron interaction among themselves and with other excitations. Specific systems for the proposed study are lateral superlattices on vicinal plane quantum wells for both III-V and silicon/germanium composites and p-type quantum wells. The theory of optical properties in these systems will be investigated and used to predict and to understand observed optical phenomena. In particular, the time evolution of the optical spectra with specific polarizations will be studied on a picosecond scale. Study of the electronic interaction will also be extended to solids with narrow electronic bands. %%% Semiconductor heterostuctures are layered composite structures having at least one very small dimension. Such structures are being investigated intensively for application, particularly as optoelectronic devices. This project will examine issues central to such applications, including the effect of the minute size on energy and spin relaxation. The optical properties, both static and dynamic, of this class of artificially structured materials will be examined. These studies are aimed at understanding the intrinsic effect of the heterostructure design on the desired characteristics, including optical frequency range, bandwidth, and sensitivity of the ultamate device.