CAREER: TUNING QUANTUM STATES OF MAGNETIC TOPOLOGICAL SYSTEMS WITH PRESSURE

非技术摘要：量子磁体是量子计算和未来绿色技术的有前途的平台。作为一个新兴的和动态发展的研究领域，这些材料的基本物理和设计原理的充分理解仍然缺乏。本项目的目标是利用外部压力作为控制参数来揭示复杂的量子相，提高我们对涌现相的理解和控制能力。这些研究为进一步合成新型量子材料提供了见解。综合教育和推广活动的重点是通过以下方式弥合阿拉巴马州STEM劳动力教育的差距：(i)在多规模设施中直接培训下一代科学家，重点关注女性和代表性不足的少数民族；（ii）通过组织现代同步加速器技术和应用系列讲座，提高阿拉巴马州的STEM研究和教育能力；（iii）为UAB物理-STEM教学孵化器项目做出贡献，以加强全州高中科学教师的培训；（iv）通过在McWane科学中心做志愿者，提高公众对STEM职业道路的认识和对科学发现的兴趣，并向广大受众传播科学发现。技术文摘：本征磁性拓扑材料表现出奇异的拓扑量子现象，在未来的量子计算和自旋电子学中具有巨大的应用潜力。本项目以外部压力为调节旋钮，旨在通过实验发现新的量子现象，在实际材料中实现理想的磁Weyl态，揭示代表性磁Dirac材料中磁结构、晶体对称性和拓扑态的相互作用。该研究采用了一套尖端的实验技术，包括最先进的基于同步加速器的光谱，散射和衍射技术，以及基于实验室的输运和磁化技术，结合了金刚石砧细胞和压电单轴应变细胞。综合实验结果旨在为处理多体物理和拓扑相互作用的理论模型提供基准。对涌现特性的基本理解有助于利用磁性拓扑材料进行未来的应用。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

Non-technical abstract: Quantum magnets are promising platforms for quantum computation and future green technologies. As an emerging and dynamically evolving research area, adequate understanding of fundamental physics and design principles of these materials are still lacking. The goal of this project is to use external pressure as a control parameter to reveal complex quantum phases and advance our understanding and control ability of the emergent phases. The studies provide insights to further synthetic efforts of novel quantum materials. The integrated education and outreach activities focus on bridging the gap of STEM workforce education in Alabama by (i) directly training next generation scientists at multi-scale facilities with a focus on women and underrepresented minorities, (ii) enhancing STEM research and education capacity in Alabama through organizing Lecture Series on Modern Synchrotron Techniques and Applications, (iii) contributing to the UAB physics-STEM Teaching and Learning Incubator program to enhance state-wide high school science teacher training, and (iv) promoting awareness in STEM career pathway and interest in scientific discovery in general public and disseminating scientific discoveries to broad audience through volunteering at McWane Science Center. Technical abstract: Intrinsic magnetic topological materials exhibit exotic topological quantum phenomena with great potential applications in future quantum computation and spintronics. Using external pressure as a tuning knob, the project targets to experimentally discover novel quantum phenomena, realize ideal magnetic Weyl state in real materials, and unravel the interplay of magnetic structure, crystal symmetry, and topological states in representative magnetic Dirac materials. The research employs a suite of cutting-edge experimental techniques, including the state-of-the-art synchrotron-based spectroscopy, scattering, and diffraction techniques, and lab-based transport and magnetization techniques combining with diamond anvil cell and piezoelectric uniaxial strain cell. The comprehensive experimental results aim to benchmark theoretical models for treatment of interplay of many-body physics and topology. The fundamental understanding of the emergent properties helps to harness the magnetic topological materials for future applications.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.