CAREER: Observing topological magnetoelectric effects by magneto-optics and quantum transport

职业：通过磁光和量子输运观察拓扑磁电效应

• 批准号: 2143177
• 负责人: Suyang Xu
• 金额: $ 89.02万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-02-01 至 2027-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2143177&HistoricalAwards=false
• 关键词: CAREER; Observing; topological; magnetoelectric; effects

NON-TECHNICAL DESCRIPTION: Quantum technologies can solve some of the world’s most challenging problems including medicine design, artificial intelligence and cyber security as well as fundamental physics and chemistry research. Therefore, their realization is crucial for national health, prosperity and security. In order to develop quantum technologies, new materials are needed in which quantum effects are pronounced and therefore can be accessed, controlled and harnessed. This project focuses on a particular quantum mechanical phenomenon called the magnetoelectric effect, which describes the coupling between electricity and quantum mechanical spin. By discovering and exploring novel materials, this project aims to achieve control of quantum spin by electrical means with unprecedented precision, efficiency and robustness. The project pushes the knowledge boundary of quantum physics, with the potential to make completely unexpected discoveries. The project trains next-generation quantum scientists and engineers. Graduates can find employment in academia in the area of fundamental quantum science research and in technology companies pursuing quantum technologies. This project also includes strong educational and outreach activities with particular focus on helping underrepresented groups by collaborating with a historically black research university and promoting STEM in K12 students and among the general public. TECHNICAL DESCRIPTION: This project aims to identify fundamentally new kinds of magnetoelectric effects that are uniquely enabled by the nontrivial topology and Berry curvature in topological materials. In sharp contrast to the magnetoelectric effects found in wide-gap magnetic insulators, the magnetoelectric effects in topological materials can exhibit unprecedented characters such as being quantized, diverging, and dissipationless. The project focuses on three classes of topological phases, Axion insulators, magnetic Weyl semimetals, and gyrotropic superconductors, and the project utilizes magneto-optics, nonlinear optics and quantum transport. The observation of topological magnetoelectric effect represents discoveries of new fundamental quantum physics, which pushes the frontiers of important topics of current quantum condensed matter research including topology, correlation, magnetism and spintronics. The topological magnetoelectric effects also open the door for urgently needed new device principles, most noticeably topological magnetoelectric devices, where simultaneous tuning of electrical and magnetic properties can be achieved without dissipation through a cohesive, multi-disciplinary approach involving electronics, physics and materials. The project contains unique education and outreach activities, including new teaching concepts to bridge and fuse physics and chemistry, collaboration with a historically black research university to create year-long research exchange activity, as well as promoting STEM in K-12 students and the general public by blending quantum science with cultural and art activities.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.

非技术描述：量子技术可以解决一些世界上最具挑战性的问题，包括药物设计、人工智能和网络安全以及基础物理和化学研究。因此，它们的实现对国家健康、繁荣和安全至关重要。为了发展量子技术，需要新的材料，在这种材料中量子效应明显，因此可以访问、控制和利用。这个项目专注于一种特殊的量子力学现象，称为磁电效应，它描述了电和量子力学自旋之间的耦合。通过发现和探索新材料，该项目旨在通过电子手段实现对量子自旋的控制，具有前所未有的精度、效率和稳健性。该项目推动了量子物理的知识边界，有可能做出完全意想不到的发现。该项目培养下一代量子科学家和工程师。毕业生可以在基础量子科学研究领域的学术界和追求量子技术的技术公司找到工作。该项目还包括强有力的教育和外联活动，特别侧重于通过与一所历史上的黑人研究型大学合作并在K12学生和普通公众中推广STEM来帮助代表性不足的群体。技术描述：该项目旨在从根本上识别由拓扑材料中的非平凡拓扑和Berry曲率唯一实现的新型磁电效应。与宽间隙磁绝缘体中的磁电效应形成鲜明对比的是，拓扑材料中的磁电效应具有量子化、发散、无耗散等前所未有的特性。该项目专注于三类拓扑相：轴离子绝缘体、磁性Weyl半金属和回转超导体，该项目利用了磁光、非线性光学和量子输运。拓扑磁电效应的观测代表着新的量子基础物理的发现，它推动了当前量子凝聚态研究的前沿，包括拓扑学、关联、磁学和自旋电子学。拓扑磁电效应也为迫切需要的新器件原理打开了大门，最引人注目的是拓扑磁电器件，在这种器件中，通过涉及电子、物理和材料的多学科方法，可以在没有耗散的情况下实现电和磁性能的同时调节。该项目包含独特的教育和推广活动，包括沟通和融合物理化学的新教学理念，与一所历史悠久的黑人研究型大学合作创建为期一年的研究交流活动，以及通过将量子科学与文化和艺术活动相结合在K-12学生和普通公众中推广STEM。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Quantum metric nonlinear Hall effect in a topological antiferromagnetic heterostructure

• DOI: 10.1126/science.adf1506
• 发表时间: 2023-06
• 期刊: Science
• 影响因子: 56.9
• 作者: Anyuan Gao;Yu-Fei Liu;Jian-Xiang Qiu;B. Ghosh;Thaís V Trevisan;Y. Onishi;Chaowei Hu;Tiema Qian;Hung-Ju Tien;Shaojuan Chen;Mengqi Huang;Damien Bérubé;Houchen Li;C. Tzschaschel;T. Dinh;Zhengyuan Sun;Sheng-Chin Ho;S. Lien;Bahadur Singh;Kenji Watanabe;T. Taniguchi;D. Bell;Hsin Lin;Tay-Rong Chang;C. Du;A. Bansil;L. Fu;Ni Ni-Ni;P. P. Orth-P.;Qiong Ma;Su-Yang Xu

Axion optical induction of antiferromagnetic order

• DOI: 10.1038/s41563-023-01493-5
• 发表时间: 2023-03
• 期刊: Nature Materials
• 影响因子: 41.2
• 作者: Jian-Xiang Qiu;C. Tzschaschel;J. Ahn;Anyuan Gao;Houchen Li;Xin-Yue Zhang;B. Ghosh;Chaowei Hu;Yu-Xuan Wang;Yu-Fei Liu;Damien Bérubé;T. Dinh;Zhenhao Gong;S. Lien;Sheng-Chin Ho;Bahadur Singh;Kenji Watanabe;T. Taniguchi;D. Bell;Hai-Zhou Lu;A. Bansil;Hsin Lin;Tay-Rong Chang;B. Zhou;Qiong Ma;A. Vishwanath;Ni Ni-Ni;Su-Yang Xu