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

0076466 Markelz该基金支持获得和使用一个多功能的，光学访问，高场（10 T），分裂线圈超导磁体系统，用于半导体中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。本研究的目的是实现几个突出的物理问题的理解：1）在横向起伏量子点的GaAs/AlGaAs中的激子的内部跃迁，2）在GaAs/AlGaAs量子威尔斯光激发的中性激子的动力学，和3）在高温超导体（HTSC）的动态电导率和弛豫时间在中红外和太赫兹光谱的区域。 从这些研究中也有望发展出对低维半导体结构的基本光激发行为的更好理解，激子在量子计算的实现中可能是重要的。 此外，这项研究将为高温超导材料的基本难题之一，即正常状态下的表观非费米液体输运行为提供洞察力。该项目支持获得高磁场，光学访问，利用我们现有的多功能光学系统，低温系统能够对具有基础和技术意义的材料系统进行独特的光学研究，微波到紫外线。 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。 本研究的目的是要理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量子威尔斯中光激发中性激子的动力学，3）高温超导体（HTSC）在中红外和太赫兹波段的动态电导率和弛豫时间。 这些研究将提高目前的理解的行为的基本光激发的低维半导体结构，这可能是重要的量子计算的实现。 此外，这项研究将为高温超导性的起源提供深入了解。

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.