Acquisition of Optical Access Superconducting Magnet System for Materials Physics Research and Education

这笔赠款支持获得和使用多功能、光学通道、高场(10T)、分裂线圈超导磁体系统，用于实验研究半导体中的量子点和准二维激子，以及高温超导体的动态电导。这项研究旨在了解几个悬而未决的物理问题：1)GaAs/AlGaAs横向涨落量子点中激子的内跃迁，2)GaAsAlGaAs光激发中性激子的动力学，以及3)高温超导体(HTSC)在中红外和太赫兹光谱范围内的动态电导和弛豫时间。通过这些研究，人们有望更好地理解低维半导体结构的基本光激发的行为，激子在量子计算的实现中可能是重要的。此外，这项研究将深入了解高温超导材料的一个基本难题，即正常状态下的表观非费米液体输运行为。该项目支持获取高磁场、光学通道、低温系统，以便能够使用我们现有的多功能光学系统对具有基础和技术意义的材料系统进行独特的光学研究，该系统的频率范围从微波到紫外线。我们将首先关注两个材料系统：半导体中的量子受限电子结构和高温超导体。这项研究旨在了解几个悬而未决的物理问题：1)Ga As/Al Ga As量子点中激子的内跃迁，2)Ga As/Al Ga As量子阱中光激发中性激子的动力学，3)高温超导(HTSC)在中红外和太赫兹区的动态电导和弛豫时间。这些研究将提高目前对低维半导体结构的基本光激发行为的理解，这在量子计算的实现中可能是重要的。此外，这项研究将提供对高温超导起源的洞察。

0076466MarkelzThis grant supports the acquisition and use of a versatile, optical-access, high-field (10T), split-coil superconducting magnet system for experimental investigations of quantum dots and quasi-two-dimensional excitons in semiconductors, and the dynamical conductivity of high Tc superconductors. This research is directed at achieving an understanding of several outstanding physics problems: 1) Internal transitions of excitons in lateral fluctuation quantum dots in GaAs/AlGaAs, 2) dynamics of photoexcited neutral excitons in GaAs/AlGaAs quantum wells, and 3) the dynamical conductivity and relaxation times in high temperature superconductors (HTSC) in the mid-infrared and terahertz regions of the spectrum. An improved understanding of the behavior of the fundamental optical excitation of low-dimensional semiconductor structures, the exciton, which may be important in implementations of quantum computation, is also expected to be developed from these studies. In addition, this research will provide insight into one of the fundamental conundrums of high temperature superconductor materials, the apparent non-Fermi liquid transport behavior in the normal state.This project supports the acquisition of a high magnetic field, optical access, cryogenic system to enable unique optical studies of materials systems of fundamental and technological interest using our existing versatile optical systems that range in frequency from the microwave to the ultra violet. We will initially focus on two materials systems: quantum confined electronic structures in semiconductors and high temperature superconductors. This research is directed at achieving an understanding of several outstanding physics problems: 1) Internal transitions of excitons in quantum dots in GaAs/AlGaAs, 2) dynamics of photoexcited neutral excitons in GaAs/AlGaAs quantum wells, and 3) the dynamical conductivity and relaxation times in high temperaturesuperconductors (HTSC) in the mid-infrared and terahertz regions of the spectrum. These studies will improve present day understanding of the behavior the fundamental optical excitations of low-dimensional semiconductor structures, which may be important in implementations of quantum computation. In addition, this research will provide insight into the origins of high temperature superconductivity.