Cavity Spintronics: Expanding the horizons for microwave, THz, magnetic, and quantum technologies

腔自旋电子学是一门新兴的交叉学科，始于2014年左右。它利用已经改变了许多其他学科的空腔技术来研究磁性材料和电磁波之间的强光-物质相互作用。一方面通过自旋光子纠缠的量子物理学，另一方面通过经典的电动力学耦合，这个领域的出现将一些最令人兴奋的现代物理学，如量子信息和量子光学，与地球上最古老的科学之一——磁学联系起来。现在是利用腔自旋电子学的新物理学来扩展微波、太赫兹、磁和量子技术的视野的最佳时机。在过去的四年里，我和我的学生在揭示和利用具有自旋和光子特征的多功能准粒子腔磁振子极化子（CMP）的物理学方面做出了原创和独特的贡献，这也是我们自己的研究势头的关键。在这些机会的基础上，我的研究计划的目标是使用腔自旋电子学方法来解决自旋光子耦合系统中光-物质相互作用的基本问题，并为创新微波，太赫兹，磁性和量子技术创造新的设备。我们独特的优势源于我们世界领先的高灵敏度电检测CMP的能力，直接探测CMP的幅度和相位的能力，熟练地制造片上高质量的腔电路，以及我的实验室的研究基础设施的能力，在过去的5年里，我的实验室更新了一套庞大的工具，用于在极端条件下进行腔自旋电子学实验(如在高磁场，超低温，并与交流调制到高频)。我们将使用这些技术来研究铁磁金属，铁磁绝缘体，反铁磁体，以及由这些材料和高质量腔体组合而成的具有定制功能的混合器件。我们将研究的关键课题包括发明基于CMP的固态脉泽，开发微波传输的非互易控制，探索太赫兹腔自旋电子学，以及促进腔增强传感的工业应用。与BlackBerryr、Everspin和OPI Systems的研究人员现有的工业合作将使我的实验室的进展迅速转化为商业用途的概念验证或原型设备，因此将对快速发展的腔自旋电子学领域产生重大影响。该计划的资金将主要用于支持4名研究生和2名本科生（每年），培训他们获得在加拿大经济的知识密集型信息和通信技术（ICT）部门非常需要的独特技能。

Cavity Spintronics is a newly developing interdisciplinary field that started around 2014. It utilizes cavity techniques, which have transformed many other disciplines, to investigate the strong light--matter interaction between magnetic materials and electromagnetic waves. Via the quantum physics of spin--photon entanglement on the one hand, and via classical electrodynamic coupling on the other, the emergence of this field connects some of the most exciting modern physics, such as quantum information and quantum optics, with one of the oldest sciences on the earth, magnetism. Now is the right time to harness the new physics of cavity spintronics to expand the horizons for microwave, THz, magnetic, and quantum technologies. Also key to the timing of this proposal is our own research momentum built up in the past 4 years, during which my students and I have made original and unique contributions to reveal and utilize the physics of the cavity magnon polariton (CMP), a versatile quasi-particle that has both spin and photon characteristics.     Building on these opportunities, the goals of my research program are to use cavity spintronics approaches to address the fundamental questions of light--matter interaction in spin-photon coupled systems, and to create novel devices for innovating microwave, THz, magnetic, and quantum technologies. Our unique advantage stems from our world--leading ability to electrically detect CMP with high sensitivity, the ability to directly probe both the amplitude and phase of CMP, the proficiency of fabricating on--chip high--quality cavity circuits, and the capacity of the research infrastructure in my lab which was renovated in the past 5 years with a vast set of tools for performing cavity spintronics experiments at extreme conditions (such as in high magnetic fields, at ultra-low temperatures, and with ac modulations up to high frequencies). We will use these techniques to study ferromagnetic metals, ferromagnetic insulators, antiferromagnets, as well as hybrid devices with tailored functions made of the combination of these materials and high--quality cavities. Examples of key topics that we will work on include inventing the CMP--based solid-state maser, developing non-reciprocal control of microwave transmission, exploring THz cavity spintronics, and facilitating industrial applications of cavity--enhanced sensing. Existing industrial collaborations with researchers at BlackBerryr, Everspin, and OPI Systems will allow rapid translation of advances in my lab into either proof- of- concept or prototype devices for commercial use, and will therefore have a significant impact in the quickly advancing field of cavity spintronics. Funding for this program will be primarily used for supporting 4 graduate and 2 undergraduate students (every year), training them to gain unique skills highly desirable in the knowledge-intensive information and communication technology (ICT) sector of the Canadian economy.