CAREER: Electrical Control of Topological Phases in Layered Semimetals

职业：层状半金属拓扑相的电控制

• 批准号: 2238254
• 负责人: Jin Hu
• 金额: $ 57.95万
• 依托单位: University of Arkansas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-05-15 至 2028-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2238254&HistoricalAwards=false
• 关键词: CAREER; Electrical; Control; Topological; Phases

This project is jointly funded by CMP Program and by the Established Program to Stimulate Competitive Research (EPSCoR).Non-technical abstract:The theory of topological phases and phase transitions, which is the seminal work of the 2016 Nobel Prize in Physics, establishes the foundation for a novel class of materials, referred as topological quantum materials. Electrons in these materials behaves like particles, thus enabling exploring high energy physics in tabletop experiments on solid state materials. These materials have been leading to deeper knowledge of important topics in physics, and display a kaleidoscope of novel electronic properties with great promise for technology applications, such as very high mobility or even dissipationless transport for energy-saving devices. The ability to manipulate these properties, particularly using electrical approaches to switch on and off, enhancing or suppression, is expected to enable a new generation of technology. This project aims to develop such ability to provide insights to implement those novel materials in technology applications. Integrated into the research activities is a broad scope of educational and outreach efforts to prepare a multi-talented and diverse quantum material workforce, including implementing a scalable approach to train an inclusive group of students of various levels, creating interdisciplinary courses to enhance material science education and prepare students for career paths, and partnering with a historically black college or university and a local underrepresented community to enhance research and education opportunities. Technical abstract:This project pursues the electrical control of topological electronic states by engineering lattice and time reversal symmetries in layered topological semimetals. Topological phase control is performed by electrostatic electron and hole doping and electrochemical intercalation in all-solid electrical double layer devices, which is based on the hypothesis that electron density acts as a tuning knob to modify these symmetries and drive topological phase transitions. This research aims to topological phase transitions between Dirac nodal-line semimetal, topological insulator, normal insulator, and Weyl semimetal phases. The obtained knowledge and developed techniques further enable the spatially selective control of topological phases to form lateral heterostructures, leading to a versatile platform to explore exciting quantum physics. Based on that, this project also targets to establish and demonstrate concrete strategies for realizing completely confined topological fermions and creating fundamentally new insights for novel confinement-induced phenomena in topological quantum materials. Finally, the education plan is closely integrated and leverages the research activities by training a diverse workforce with a broad mix of quantum-related skills, and in the long term, continue to benefit the condensed matter and materials science research.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.

该项目由CMP计划和刺激竞争性研究的既定计划（EPSCoR）共同资助。非技术摘要：拓扑相和相变理论是2016年诺贝尔物理学奖的开创性工作，为一类新材料奠定了基础，称为拓扑量子材料。这些材料中的电子表现得像粒子，因此能够在固态材料的桌面实验中探索高能物理。这些材料已经导致了对物理学中重要主题的更深入的了解，并显示出新颖的电子特性的万花筒，具有很大的技术应用前景，例如非常高的迁移率甚至是节能设备的无耗散传输。操纵这些特性的能力，特别是使用电气方法来打开和关闭，增强或抑制，有望实现新一代技术。该项目旨在开发这种能力，以提供在技术应用中实施这些新材料的见解。整合到研究活动中的是广泛的教育和推广工作，以准备一支多才多艺和多样化的量子材料劳动力队伍，包括实施可扩展的方法来培训一个包容性的各级学生群体，创建跨学科课程，以加强材料科学教育，并为学生的职业道路做好准备，并与历史悠久的黑人学院或大学以及当地代表性不足的社区合作，以增加研究和教育机会。技术摘要：该项目通过在层状拓扑半金属中设计晶格和时间反演对称性来实现拓扑电子态的电气控制。在全固态双电层器件中，拓扑相控制是通过静电电子和空穴掺杂以及电化学嵌入来实现的，它是基于电子密度作为调节旋钮来改变这些对称性并驱动拓扑相变的假设。本研究的目的是研究Dirac线半金属、拓扑绝缘体、正常绝缘体和Weyl半金属相之间的拓扑相变。所获得的知识和开发的技术进一步使拓扑相位的空间选择性控制，以形成横向异质结构，导致一个多功能的平台，探索令人兴奋的量子物理。在此基础上，该项目还旨在建立和展示实现完全受限拓扑费米子的具体策略，并为拓扑量子材料中的新型约束诱导现象创造全新的见解。最后，该教育计划与研究活动紧密结合，通过培训具有广泛量子相关技能的多元化劳动力，并从长远来看，继续受益于凝聚态和材料科学研究。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

Coupling Between Magnetic and Transport Properties in Magnetic Layered Material Mn2-xZnxSb

• DOI: 10.1016/j.actamat.2023.119251
• 发表时间: 2023-08
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: Md Rafique Un Nabi;R. Basnet;K. Pandey;S. Chhetri;Dinesh Upreti;Gokul Acharya;Fei Wang;A. Fereidouni;H. Churchill;Yingdong Guan;Z. Mao;Jin Hu