Optical Spectroscopy of Quantum-Layered Semiconductors in High Magnetic Field

高质量半导体的最新制造 异质结构导致了新的和非凡的物理学 在二维电子气系统中发现的。 磁- 输运实验表明， 当电子具有朗道能级的分数值时 填充。 随后的理论研究表明， 分数量子霍尔效应是一种新的 协同多体电子流体 虽然大部分 实验使用电传输，我们最近的光学 调查将有助于更好地了解 凝聚电子态，并可能形成新的电子-电子 交互. 这项工作将是一个光学研究的两个- GaAs量子威尔斯中的二维电子系统对温度的影响 低至0.05K直流磁场高达30特斯拉 光谱 技术涉及带隙发射、吸收和反射， 和非弹性光散射。 新的光纤系统将 在这些极端的光散射实验中， 温度和磁场。

The recent fabrication of high-quality semiconductor heterostructures has led to novel and remarkable physics discovered in two-dimensional electron gas systems. Magneto- transport experiments have shown that resistivity anomalies occur when the electrons have fractional values for Landau level filling. Subsequent theoretical studies revealed that the fractional quantum Hall effect is a manifestation of a new cooperative many-body electron fluid. although most of the experiments use electrical transport, our recent optical investigations will lead to a better understanding of the condensed electron state and possibly to new electron-electron interactions. This work will be an optical study of the two- dimensional electron system in GaAs quantum wells to temperatures as low as .05K and dc magnetic fields to 30 tesla. Spectroscopic techniques involve bandgap emission, adsorption and reflectivity, and inelastic light scattering. New fiber-optic systems will be implemented for light scattering experiments at these extrema of temperature and magnetic field.