Single-Molecule Magnets: Internal Degrees of Freedom and Quantum Dynamics

非技术摘要：本项目旨在开发必要的实验和教育工具，以便在广泛的实验条件下研究、理解和传播纳米分子磁体的量子动力学。纳米材料量子性质的控制导致了新的新兴技术的出现，如量子信息和计算过程。纳米级分子系统在超高密度集成和量子信息处理方面具有巨大的潜力，这些技术都是基于本项目所研究的基本性质的。拟议的研究与一系列教育活动紧密结合。几名研究生和本科生将接受无机化学与基础和应用物理之间的培训，并接触到首席研究人员多年来建立的大型、跨学科和国际合作网络。此外，这项研究还支持由首席研究员领导的一项倡议，即在UCF创建新的纳米科学和技术辅修和学士学位，这些学位是围绕三个新的纳米课程建立的，该项目的研究将在这些课程中展示。这些课程以服务学习课程的形式提供，旨在促进奥兰多大都市区参与中学的K-12学生早期参与科学。技术摘要：该项目旨在巩固一个综合的实验和教育框架，用于学习、理解和传播知识，详细说明在广泛的实验条件下单分子磁体的磁性。具体的科学目标是：a)了解内部自由度在分子纳米磁体中磁化的量子隧道中所起的作用，以及b)研究弱耦合和强耦合区域中SMM中光-物质相互作用的性质，目的是鉴于其在量子信息、分子自旋电子学和相关新兴技术中的应用，实现对分子自旋的量子相干控制。该项目的目标是将脉冲EPR谱扩展到低温(~100mk)，通过使用高灵敏度微带谐振器(包括高品质因数超导共面波导谐振器)来实现，有望实现对退相干速率的测量，其灵敏度比以前的研究低两个数量级。事实上，这个项目产生的实验装置允许研究三个主要的消相干源，例如偶极消相干、原子核消相干和振动消相干。减少和控制分子纳米磁体中的消相干源可能会使量子算法和量子纠错协议所需的大量门操作成为可能。此外，其固有的磁性分子各向异性使分子纳米磁体成为新兴的分子自旋电子学领域的研究热点。该研究项目与一系列旨在培训无机化学与基础和应用物理之间的界面的研究生和本科生的教育活动紧密结合在一起，并接触到国际科学研究所多年来建立的大型、跨学科和国际合作网络。该提案对继续让代表性不足的群体参与各级研究的计划制定了战略，促进实验室多样性的PI活动的良好记录表明了这一点。此外，这项研究还支持了由首席研究员领导的一项倡议，即在加州大学伯克利分校开设纳米科学与技术的新辅修学位和学士学位，这两个学位是围绕三个新的纳米课程建立的，其中将展示项目？S的研究。这些课程以服务学习课程的形式提供，旨在促进奥兰多大都市区参与中学的K-12学生早期参与科学。

Non-technical abstract:This project seeks to develop the necessary experimental and educational tools for the study, understanding and dissemination of the quantum dynamics of nanometer sized molecular magnets under a broad range of experimental conditions. The control of quantum properties of nanoscale materials has led to the appearance of new emerging technologies, such as quantum information and computation processes. Nanoscale molecular systems have great potential for ultra-high density integration and quantum information processing, which are technologies that base on the fundamental properties studied in this project. The proposed research is strongly integrated with a series of educational activities. Several graduate and undergraduate students will be trained at the interface between inorganic chemistry and fundamental and applied physics, and exposed to a large, interdisciplinary and international net of collaborations that the principal investigator has established over many years. In addition, the research supports an initiative led by the principal investigator to create new Minor and B.A. degrees in Nanoscale Science and Technology at UCF, which are built around three new nano-courses where the project's research will be showcased. The courses are offered as Service-Learning courses and designed to promote the early involvement in science of K-12 students in participating middle schools in the Orlando metropolitan area.Technical abstract:This project seeks to consolidate an integrated experimental and educational framework for the study, understanding, and dissemination of knowledge that details the magnetic properties of single-molecule magnets under a broad range of experimental conditions. The specific scientific goals are: a) to understand the role played by internal degrees of freedom in the quantum tunneling of magnetization in molecular nanomagnets, and, b) to study the nature of the light-matter interaction in SMMs in the weak and strong coupling regimes, with the goal of achieving quantum coherent control over the molecular spin in view of application in quantum information, molecular spintronics and related emerging technologies. The project goals base on an expansion of pulse EPR spectroscopy extending down to low temperatures (~100mK), achieved with the use of high-sensitivity microstrip resonators (including high quality factor superconducting coplanar waveguide resonators), is expected to enable measurements of decoherence rates with a sensitivity two orders of magnitude smaller than those attained in previous studies. Indeed, the experimental setup resulting from this project allows the investigation of the three primary sources of decoherence, e.g., dipolar, nuclear and vibronic. Diminishing and controlling sources of decoherence in molecular nanomagnets may enable the large number of gate operations demanded by quantum algorithms and quantum error correction protocols. In addition, their intrinsic magnetic molecular anisotropy makes molecular nanomagnets natural systems of interest for the emerging field of molecular spintronics. The research project is strongly integrated with a series of educational activities designed to train graduate and undergraduate students at the interface between inorganic chemistry and fundamental and applied physics, and exposed to a large, interdisciplinary and international net of collaborations that the PI has established over many years. The proposal strategizes plans to continue an involvement of underrepresented groups in research at all levels, as illustrated in a strong record of activities undertaken by the PI that promote diversity in the laboratory. In addition, the research supports an initiative led by the principal investigator to create new Minor and B.A. degrees in Nanoscale Science and Technology at UCF, which are built around three new nano-courses where the project?s research will be showcased. The courses are offered as Service-Learning courses and designed to promote the early involvement in science of K-12 students in participating middle schools in the Orlando metropolitan area.