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

采购用于材料物理研究和教育的光学接入超导磁体系统

• 批准号: 0076466
• 负责人: Andrea Markelz
• 金额: $ 7.73万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2002-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0076466&HistoricalAwards=false
• 关键词: Acquisition; Optical; Access; Superconducting; Magnet

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.

该基金支持获取和使用一种多功能、光通道、高场（10T）、分裂线圈超导磁体系统，用于半导体中的量子点和准二维激子的实验研究，以及高Tc超导体的动态电导率。本研究旨在了解几个突出的物理问题：1)GaAs/AlGaAs中横向波动量子点中激子的内部跃迁，2)GaAs/AlGaAs量子阱中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区域的动态电导率和弛豫时间。对低维半导体结构的基本光激发行为的更好理解，激子，这在量子计算的实现中可能是重要的，也有望从这些研究中得到发展。此外，本研究将为高温超导体材料的基本难题之一，即正常状态下的明显非费米液体输运行为提供见解。该项目支持获取高磁场、光学访问、低温系统，以利用我们现有的从微波到紫外线频率范围的多功能光学系统，对基础和技术感兴趣的材料系统进行独特的光学研究。我们将首先关注两种材料系统：半导体中的量子限制电子结构和高温超导体。本研究旨在了解几个突出的物理问题：1)GaAs/AlGaAs量子点中激子的内部跃迁，2)GaAs/AlGaAs量子阱中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区域的动态电导率和弛豫时间。这些研究将提高目前对低维半导体结构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，这项研究将为了解高温超导的起源提供洞见。