Microscopic Investigation of Quantum Materials

量子材料的显微研究

• 批准号: 261708-2013
• 负责人: Imai, Takashi
• 金额: $ 3.79万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=525343
• 关键词: Microscopic; Investigation; Quantum; Materials

The main focus of my research is in understanding the non-intuitive quantum behavior of solids. We specialize in cryogenic NMR (Nuclear Magnetic Resonance), and conduct microscopic investigations of a wide range of quantum materials with basic scientific interests as well as long-term potential for technological innovations, e.g. iron-based high temperature superconductors, spin-liquids, dilute magnetic semiconductors (DMS), and graphene. NMR is good at gaining deep insight into why electrons behave the way they do at microscopic levels. The overarching theme that encompasses all of our projects is therefore in answering: "How does it happen?" For example, iron-pnictides can superconduct without electrical resistance below 55 K; how can electrons form superconducting Cooper pairs with singlet spins, even though iron is a ferromagnet with parallel spins? DMS exhibit ferromagnetic behavior above ~100 K, with the prospect for spintronics applications in the future; how do dilute magnetic moments interact with each other in semiconductors with such large energy scales? To address these curiosity-based questions with the potential for major impacts on technologies, we conduct in-house research in my exceptionally well-equipped cryogenic NMR laboratory. My students have unlimited access to our Oxford top-loading dilution refrigerator (base temperature 9 mK), Janis top-loading helium-3 cryostat (base temperature 350 mK), three types of superconducting magnets (up to 16 Tesla), and three NMR spectrometers, and drive our high-profile research projects with world-class collaborators. My laboratory thus provides students with scientific research training and versatile problem solving skills for their future employments through the designing, manufacturing, computer interfacing and maintenance of our equipment. In the coming 5 years, I plan to extend our research operation both in terms of the group size and scope, by expanding into new and exciting directions of research such as DMS and graphene, while maintaining our international presence in unconventional superconductivity and quantum magnetism.

我的研究的主要重点是了解固体的非直觉量子行为。 我们专门研究低温NMR（核磁共振），并对具有基本科学利益的广泛量子材料以及技术创新的长期潜力进行微观研究，例如铁基高温超导体，自旋液体，稀磁半导体（DMS）和石墨烯。 NMR擅长深入了解为什么电子在微观水平上的行为方式。 因此，包含我们所有项目的总体主题是回答：“它是如何发生的？” 例如，铁刺体可以超导导，而无需低于55 K的电阻；即使铁是带有平行自旋的铁磁铁，电子如何与单线旋转形成超导对接？ DMS表现出高于100 K的铁磁行为，将来对Spintronics应用的前景具有前景。稀释磁矩如何在具有如此大的能量尺度的半导体中相互相互作用？ 为了解决这些基于好奇心的问题，并可能对技术产生重大影响，我们在设备齐全的低温NMR实验室中进行内部研究。 我的学生可以无限制地访问我们的牛津顶载稀释冰箱（碱温度9 MK），Janis载荷的氦气3低温恒温器（基本温度350 MK），三种类型的超导磁铁（最多16台Tesla）和三个NMR光谱仪以及三个NMR光谱仪，并推动我们与世界竞争的高产研究项目。 因此，我的实验室通过设计，制造，计算机接口和维护我们的设备为学生提供了科学的研究培训和多功能问题解决技能，以为他们的未来就业提供了工作。 在接下来的5年中，我计划通过扩展到DMS和石墨烯等研究的新方向来扩展我们的研究操作，同时将我们在非常规的超导性和量子磁性方面保持国际影响力。