Far Infrared and Microwave Magneto-Optical Studies of Strongly Correlated Electronic Systems

本研究涉及II型超导体和半导体异质结构的远红外和微波磁光研究。对II型超导体的涡旋核激发共振和磁光活性进行了系统的研究。目标是获得对高温超导体和涡旋动力学的一般理解。磁光研究将寻找回旋共振和光学活性的直接证据，并寻找超导体中的螺旋传播和交流霍尔效应。这些研究将在超导研究中开辟新的领域，并有望为超导体的科学和技术开辟新的道路。半导体异质结构的研究将朝向低维电子系统的低洼集体激发的研究。这些研究的目的是阐明这些强相互作用系统中的电子相关效应。将进行磁光和磁输运研究。这些研究可能会导致在三维或准三维电子系统中发现新的凝聚相，如Wigner晶体或新的相关液相。红外技术也将用于研究二维电子系统中的磁等离子体。在这种情况下，兴趣是观察和研究与分数量子霍尔效应有关的磁转子。这项研究涉及高磁场下超导体和半导体异质结构的基础研究。超导体的研究是为了提高对这些材料在微波和红外频率下的电动力学的理解。它们是基于最近在这些材料中观察到的新的磁光效应，并将在高温超导体和常规超导体中系统地研究。这些研究可能会在超导研究中开辟新的领域，它们有望为超导体的科学和技术开辟新的道路。半导体异质结构的研究将朝向低维电子系统中集体激发的研究。这些研究的目的是阐明这些强相互作用电子系统中的电子相关效应。将进行磁光和磁输运研究，并可能导致在电子系统中发现新的凝聚相。该项目涉及与工业和政府实验室的合作。

This research concerns far infrared and microwave magneto-optical studies of type II superconductors and semiconductor heterostructures. A systematic investigation of vortex core excitation resonance and the magneto-optical activity of type II superconductors will be made. The goal is to gain an understanding of high temperature superconductors and vortex dynamics in general. The magneto-optical studies will look for direct evidence for cyclotron resonance and optical activity and search for helicon propagation and the ac Hall effect in superconductors. These investigations will break new ground in superconductivity research and hold the promise of opening new paths for the science and technology of superconductors. The work on semiconductor heterostructures will be directed toward the study of the low lying collective excitations in low dimensional electron systems. The goal of these studies is to elucidate electron correlation effects in these strongly interacting systems. Magneto-optical and magneto-transport studies will be carried out. These studies may lead to the discovery of novel condensed phases such as the Wigner crystal or new correlated liquid phases in 3D or quasi 3D electron systems. The infrared techniques will also be used to study magneto plasmons in 2 dimensional electron systems. In this case the interest is the observation and study of the magneto-rotons associated with the fractional quantum Hall effect. %%% This research concerns fundamental studies of superconductors and semiconductor heterostructures in high magnetic fields. The studies on superconductors are directed toward improving the understanding of the electrodynamics of these materials at microwave and infrared frequencies. They are based on the recent observation of new magneto-optical effects in these materials and will be systematically studied in both high temperature superconductors and in conventional superconductors. These studies are likely to break new ground in superconductivity research and they hold the promise of opening new paths for the science and technology of superconductors. The work on semiconductor heterostructures will be directed toward the investigation of collective excitations in low dimensional electron systems. The goal of these studies is to elucidate electron correlation effects in these strongly interacting electron systems. Magneto-optical and magneto-transport studies will be carried out and may lead to the discovery of novel condensed pahses in electron systems. The program involves collaboration with both industrial and government laboratories.