Optical Spectroscopy of Excitons in Correlated Electron Systems

利用稳态、时间分辨光学技术和低温条件研究了强相关二维砷化镓电子态。感兴趣的研究包括无价带空穴扰动的不可压缩量子液体的研究，电子固体和复合费米子的研究，以及具有宽抛物量子阱的准三维电子系统的研究。当在极低低温和超高磁场条件下研究时，局限于半导体界面的电子态表现出不同寻常的性质。这些系统揭示了新的和完全意想不到的行为，继续研究可能会进一步深入了解高度相关电子系统的性质。测量这些性质具有内在的科学意义，但也有希望发现新的技术应用。目前的研究协调了超低温下强大的光学表征技术与最先进的半导体材料制备的优势。

DMR-9510699 Heiman Strongly correlated two dimensional electron states based on gallium arsenide are investigated in high magnetic fields using steady state and time-resolved optical techniques and low temperatures. Investigations of interest include study of the incompressible quantum liquid without perturbation by valence band holes, study of the electron solid as well as composite fermions, and the study of quasi-three dimensional electron systems with wide parabolic quantum wells. %%% Electron states confined to the interfaces of semiconductors exhibit unusual properties when investigated under conditions of very low cryogenic temperatures and ultra high magnetic fields. These systems have revealed new and completely unexpected behavior and continued studies are likely to yield further insights into the properties of highly correlated electron systems. Measurement of such properties is of intrinsic scientific interest but also holds the promise for discovery of novel technological applications. The current investigations coordinate the strengths of powerful optical characterization techniques at ultra low temperatures with state-of-the-art semiconductor materials preparation.