CAREER: Experimental Neutron Scattering and Materials-Based Exploration of Spin-Orbital Physics in Intermediate-Bandwidth Quantum Materials

职业：中子散射实验和中带宽量子材料中自旋轨道物理的基于材料的探索

• 批准号: 1521208
• 负责人: Stephen Wilson
• 金额: $ 12.01万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1521208&HistoricalAwards=false
• 关键词: CAREER; Experimental; Neutron; Scattering; Materials

Non-Technical Abstract:The electrons in a number of recently discovered materials with exciting new properties tread a fine line between two extremes: one of independent electrons largely ignoring one another (such as in good metals) and one where electrons interact so strongly with each other that they foster collective behavior. These new classes of so-called intermediate bandwidth systems occupy a unique regime where the coupling between an electron's atomic orbital motion and its intrinsic magnetic field (or spin) plays an important role in generating new electronic behavior. This project will support a neutron scattering-based experimental research program exploring the fundamental electronic behavior in three key classes of these new spin-orbit coupled materials: iron-based high temperature superconductors, iridium oxide insulators, and topological insulators; many of which possess potential for future energy transport and computing applications. The project will also support the growth of materials necessary to attack key research problems while simultaneously addressing the large national need for creative materials exploration. In addition to supporting the education of two PhD students, the project will also provide hands-on, research-based, education to underrepresented high school interns and undergraduates. The synergy fostered by this project's integration of research and educational activities will also advance a broader goal of training the next generation of neutron scattering experts in the United States.Technical Abstract:This award will support a neutron scattering-based experimental research program whose goal is to understand magnetism and competing order's role in the electronic behavior of an emerging class of intermediate bandwidth materials where strong spin-orbital coupling effects conspire to create novel properties. These materials occupy a unique coupling regime (U~W) where modest correlation can exert a dramatic influence within their resulting ground states. This project will focus on three classes of these materials where magnetic and orbital degrees of freedom are thought to play a key role: iron pnictide high temperature superconductors, novel 5d Mott insulators, and perturbed topological insulators. Work will be guided by the project-supported growth of the crystalline materials necessary to attack key issues while simultaneously addressing the large national need for creative materials exploration. In addition to supporting the education of two PhD students, the project will also provide hands-on, research-based, education to underrepresented high school interns and undergraduates. The synergy fostered by this project's integration of research and educational activities will also advance a broader goal of training the next generation of neutron scattering experts in the United States.

非技术摘要：许多最近发现的具有令人兴奋的新属性的材料中的电子踩在两个极端之间的细线：一个独立电子中的一个很大程度上彼此忽略（例如，在优质金属中），而电子彼此之间的相互作用如此强烈，以至于它们促进了集体行为。 这些新类的所谓中间带宽系统占据了独特的状态，在该方案中，电子的原子轨道运动与其内在磁场（或​​自旋）之间的耦合在产生新的电子行为中起着重要作用。 该项目将支持基于中子散射的实验研究计划，探讨这些新的自旋轨道耦合材料的三个关键类别中的基本电子行为：基于铁的高温超导体，氧化物氧化物绝缘子和拓扑绝缘子；其中许多具有未来能源运输和计算应用的潜力。 该项目还将支持攻击关键研究问题所必需的材料的增长，同时满足国家对创意材料探索的巨大需求。 除了支持两名博士学位学生的教育外，该项目还将为代表性不足的高中实习生和本科生提供动手，基于研究的教育。 The synergy fostered by this project's integration of research and educational activities will also advance a broader goal of training the next generation of neutron scattering experts in the United States.Technical Abstract:This award will support a neutron scattering-based experimental research program whose goal is to understand magnetism and competing order's role in the electronic behavior of an emerging class of intermediate bandwidth materials where strong spin-orbital coupling effects conspire to create novel properties. 这些材料占据了独特的耦合体制（U〜W），其中适中的相关性可以在其最终的基态内发挥巨大影响。 该项目将集中在这些材料的三类中，其中磁性和轨道自由度被认为起着关键作用：铁皮层高温超导体，新颖的5D Mott绝缘子和扰动的拓扑绝缘子。 工作将以攻击关键问题所需的晶体材料的项目支持的指导，同时满足国家对创意材料探索的巨大需求。除了支持两名博士学位学生的教育外，该项目还将为代表性不足的高中实习生和本科生提供动手，基于研究的教育。 该项目融合研究和教育活动所促进的协同作用还将推进更广泛的目标，即培训下一代美国的中子散射专家。