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.

非技术摘要基于量子的技术有望在计算、传感、通信和计量方面取得革命性的进步，但成功取决于材料平台的创建，在该平台中，量子态可以抵抗环境退相干，同时可以修改控制和测量。基于量子技术的一个有吸引力的方案涉及一类称为磁性拓扑绝缘体的材料，其中导电电子可以被限制在样品的边缘或表面，并且可以无阻力地流动。在该项目中，研究团队基于乐高设计方案，采用磁性拓扑绝缘体作为主要构件构建多个多层异质结构，并探索其中涌现的量子现象。该项目的成功将增进人们对磁性和拓扑之间相互作用的认识。此外，这项研究增强了宾夕法尼亚州立大学的物质努力。该研究团队积极将研究生和本科生教育融入该项目，特别注重提高代表性不足的少数族裔的参与度，并针对州立大学地区学区的 K-12 学生和教师开展外展活动。 技术摘要 磁性的当前研究拓扑态重点关注量子反常霍尔态和磁性韦尔半金属。由于缺乏合适的磁性材料平台，其他磁拓扑相的实现仍然受到限制，包括轴子绝缘体、三维量子反常霍尔态和高阶磁拓扑绝缘体。该项目的目标是使用磁性掺杂和未掺杂的拓扑绝缘体和普通绝缘体层作为构建块来构建多层异质结构，作为创建和操纵这些磁性拓扑状态的高度可调平台。通过将电输运、扫描隧道显微镜和光谱学以及角分辨光电子能谱等先进的实验探针与复杂的理论模型和材料模拟相结合，探索了这些磁性拓扑绝缘体多层异质结构的物理性质。在磁拓扑绝缘体多层异质结构中实现磁拓扑态可能为节能电子和自旋电子器件铺平道路。这项研究还为量子反常霍尔和轴子绝缘体提供了科学基础，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 的法定使命，并通过使用基金会的智力价值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

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