Exploring Two-dimensional Electron Gases at Extreme Magnetic Fields with Optical and Terahertz 2DFT spectroscopy

非技术性：这个项目阐明了固体物质在极端条件下的基本性质，如低维和极高的磁场。对这些材料的基本性质的科学理解对下一代电子设备和21世纪的经济至关重要。该项目还将有效地培养本科生和研究生，他们将成为学术界、国家实验室和工业科学发现的未来领导者。特别是对学生进行电子材料、激光科学和应用以及强磁场方面的培训。佛罗里达州和阿拉巴马州的少数民族中学生接触到了尖端科学研究。技术：本研究项目将集中于USF和UAB的研究人员的联合研究，以阐明高迁移率调制掺杂的GaAsAlGaAs系统的相干寿命。USF团队将进行二维傅里叶变换(2DFT)实验，这是相干四波混频测量的增强形式，类似于将核磁共振扩展到二维。UAB团队将开发一种新的太赫兹频率光谱仪，该光谱仪将采用成熟的技术，使用倾斜波前配置中的非线性差频产生和类似于近红外2DFT技术的多脉冲技术来产生高峰值功率太赫兹脉冲。这两个实验都将使用新的分离式螺旋磁铁在25T下进行测量，这是由国家高磁场实验室的研究人员定制设计的，以实现下一代光学测量。这一新的磁体将使USF-UAB合作能够在超快激光源实验无法到达的场范围内研究高迁移率电子气中的量子相干性。这一项目将有助于我们理解退相干机制以及朗道能级间和朗道内相干性，这对它们在下一代电子学中的应用至关重要。研究团队致力于通过演讲、在国际上参加的研究会议以及在高影响力的同行评议期刊上发表我们的成果来广泛传播这一研究项目的成果。USF和UAB的研究人员都坚定地致力于培养下一代凝聚态和强磁场研究人员。为了实现这些NSF目标，我们将直接让本科生、暑期REU学生和我们的研究生参与设计、规划、实验、数据分析和数据分析，并从我们多样化的学生群体中选出传统上代表性不足的群体。

Non-technical: This project elucidates the fundamental properties of solid matter at extreme conditions, such as low dimensions and extremely high magnetic fields. The scientific understanding of the fundamental properties of these materials is crucial for the next generation of electronic devices and a 21st century economy. The project also leads to efficient training of undergraduate and graduate students who will be future leaders in scientific discovery in academia, national labs, and industry. In particular, students are trained on electronic materials, laser science and applications, and high magnetic fields. Minority middle school students in Florida and Alabama are exposed to cutting edge scientific research. Technical: This research project will focus on the joint investigation by researchers at the USF and the UAB to elucidate the coherence lifetimes in high mobility modulation doped GaAs\AlGaAs systems. The USF team will perform two-dimensional Fourier transform (2DFT) experiments, which are an enhanced form of coherent four-wave mixing measurements that are similar to the extension of nuclear magnetic resonance to two dimensions. The UAB team will develop a new terahertz frequency spectrometer that will employ well-established techniques to generate high peak power terahertz pulses using nonlinear difference frequency generation in the tilted wavefront configuration and a multiple pulse technique similar to the near infrared 2DFT techniques. Both experiments will use the new Split Helix magnet to perform measurements at 25 T, which was custom-designed by National High Magnetic Field Lab researchers to enable next generation optical measurements. This new magnet will enable the USF-UAB collaboration to study quantum coherence in high mobility electron gases in field ranges that were inaccessible to ultrafast-laser source based experiments.This project will contribute to our understanding of decoherence mechanisms and both inter- and intra-Landau level coherence, which is critical to their utilization in next generation electronics. The research team is committed to the broad dissemination of the results of this research project through presentations, internationally-attended research conferences, and publication of our results in high impact, peer-reviewed journals. Both USF and UAB researchers are strongly committed to fostering the education of the next generation of condensed matter and high magnetic field researchers. To contribute to these NSF goals, we will directly involve undergraduate, summer REU students, and our graduate students in the design, planning, experiments, data analysis and the from traditionally underrepresented groups from our diverse student bodies.