Exploring Emergent Magnetic Topological States in Three-Dimensional Magnetic Topological Insulator Multilayers

探索三维磁拓扑绝缘体多层中的涌现磁拓扑态

• 批准号: 2241327
• 负责人: Cui-Zu Chang
• 金额: $ 73万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-05-01 至 2026-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2241327&HistoricalAwards=false
• 关键词: Exploring; Emergent; Magnetic; Topological; States

Non-technical abstractQuantum-based technologies promise revolutionary advances in computing, sensing, communication, and metrology, but success hinges on the creation of a material platform in which a quantum state can be made robust against environmental decoherence yet simultaneously be amendable to control and measurement. An attractive scheme towards quantum-based technologies involves a class of materials called magnetic topological insulators where the conducting electrons can be confined to the edges or surfaces of the sample and flow without resistance. In this project, based on a LEGO design scheme, the research team employs magnetic topological insulators as primary building blocks to construct a number of multilayer heterostructures and explores the emergent quantum phenomena therein. The success of this project will advance knowledge of the interplay between magnetism and topology. Moreover, this research enhances the material efforts at Penn State. This research team actively integrates graduate and undergraduate education into the project, with a particular focus on increasing participation among underrepresented minorities, and also develops outreach activities that target K-12 students and teachers from the State College Area School District.Technical AbstractCurrent research on magnetic topological states focuses on the quantum anomalous Hall state and magnetic Weyl semimetals. The realization of other magnetic topological phases, including axion insulators, the three-dimensional quantum anomalous Hall state, and higher-order magnetic topological insulators, is still limited due to the lack of suitable magnetic material platforms. The goal of this project is to use magnetically doped and undoped topological insulators and normal insulator layers as building blocks to construct multilayer heterostructures as a highly tunable platform for creating and manipulating these magnetic topological states. The physical properties of these magnetic topological insulator multilayer heterostructures are explored by combining advanced experimental probes, such as electrical transport, scanning tunneling microscopy and spectroscopy, and angle-resolved photoemission spectroscopy, with sophisticated theoretical modeling and material simulations. The realization of magnetic topological states in magnetic topological insulator multilayer heterostructures may pave the way for energy-efficient electronic and spintronic devices. This study also provides the scientific foundation in quantum anomalous Hall and axion insulators to achieve transformative electromagnetic applications in quantum information technology.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.

基于非技术抽象的技术有望在计算，传感，交流和计量学方面取得革命性的进步，但成功取决于建立一个物质平台的建立，在该平台中，可以使量子状态可与环境腐烂相稳定，但可以同时进行控制和测量。一种针对量子技术的有吸引力的方案涉及一类称为磁性绝缘体的材料，可以将导电电子局限于样品的边缘或表面，而流动没有阻力。在该项目中，基于乐高设计方案，研究团队采用磁性拓扑绝缘子作为主要的构建块来构建许多多层异质结构，并探索其中的新兴量子现象。该项目的成功将促进磁性和拓扑之间的相互作用的知识。此外，这项研究增强了宾夕法尼亚州立大学的重大努力。该研究团队将研究生和本科教育积极地纳入该项目，特别着重于增加代表性不足的少数群体的参与，并开发了推出活动，这些活动针对的是来自州立大学学区的K-12学生和老师。技术摘要磁性拓扑研究的研究侧重于量子的磁性霍尔州立州立州立州立州立州立州立州立州和磁性的Weyl-Emimeters。由于缺乏合适的磁性材料平台，还限制了其他磁性拓扑阶段，包括轴突绝缘子，三维量子异常霍尔状态和高阶磁性绝缘体。该项目的目的是将磁性掺杂和未悬浮的拓扑绝缘子和普通绝缘体层用作构建多层异质结构的构件，作为一个高度可调的平台，用于创建和操纵这些磁性拓扑状态。通过将高级实验探针（例如电运输，扫描隧道显微镜和光谱法）以及角度分辨光发射光谱与复杂的理论建模和材料模拟相结合，可以探索这些磁性绝缘体多层异质结构的物理性能。磁性绝缘体多层异质结构中磁性拓扑状态的实现可能为节能电子和旋转器设备铺平道路。这项研究还为量子异常的大厅和轴突绝缘子提供了科学基础，以实现量子信息技术中的变革性电磁应用。该奖项反映了NSF的法定任务，并且认为值得通过基金会的知识分子优点和更广泛的影响来通过评估来获得支持。

项目成果

Electrical switching of the edge current chirality in quantum anomalous Hall insulators

• DOI: 10.1038/s41563-023-01694-y
• 发表时间: 2022-05
• 期刊: Nature Materials
• 影响因子: 41.2
• 作者: Wei Yuan;Lingjie Zhou;Kai-Jheng Yang;Yi-Fan Zhao;Ruoxi Zhang;Zijie Yan;Deyi Zhuo;Ruobing Mei;Yang Wang;H. Yi;M. Chan;M. Kayyalha;Chaoxing Liu;Cui-Zu Chang

Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures

• DOI: 10.1038/s41467-024-46717-7
• 发表时间: 2024-03-26
• 期刊: NATURE COMMUNICATIONS
• 影响因子: 16.6
• 作者: Yang，Kaijie;Xu，Zian;Liu，Chao-Xing
• 通讯作者: Liu，Chao-Xing

Interface-induced superconductivity in magnetic topological insulators

• DOI: 10.1126/science.adk1270
• 发表时间: 2024-02
• 期刊: Science
• 影响因子: 56.9
• 作者: H. Yi;Yi-Fan Zhao;Ying-Ting Chan;Jiaqi Cai;Ruobing Mei;Xianxin Wu;Zijun Yan;Lingjie Zhou;Ruoxi Zhang;Zihao Wang;Stephen Paolini;Run Xiao;Ke Wang;A. Richardella;John Singleton;Laurel E. Winter;T. Prokscha;Zaher Salman;Andreas Suter;P. Balakrishnan;A. Grutter;Moses H. W. Chan;N. Samarth;Xiaodong Xu;Weida Wu;Chaozhi Liu;Cui-Zu Chang