CAREER: Interplay of sliding ferroelectricity, spin and charge orderings in layered quantum materials

职业：层状量子材料中滑动铁电性、自旋和电荷排序的相互作用

• 批准号: 2237761
• 负责人: Jun Xiao
• 金额: $ 66.22万
• 依托单位: University of Wisconsin-Madison
• 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: 2023-04-01 至 2028-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2237761&HistoricalAwards=false
• 关键词: CAREER; Interplay; sliding; ferroelectricity; spin

Non-technical abstract:This project focuses on understanding of properties of a new class of quantum materials with unique properties, known as two-dimensional layered materials. By modeling, characterizing, and engineering the novel physics, this research aims to understand the materials properties and achieve their control. These materials can establish a new platform for energy-efficient and high-speed memory and logic devices, and compact and programmable quantum simulators to address the growing information and energy demands. Integrated with the research, the project aims to promote participation in STEM, focusing on undergraduates and K-12 teachers from groups historically underrepresented in STEM and from rural areas in Wisconsin. The PI partners with the Materials Research Science and Engineering Centers (MRSEC) education group and Engineering EXPO at the University of Wisconsin-Madison to organize “2D ferroelectrics for energy-efficient future” education and outreach program including nanomaterials research, STEM education activities development for high school classrooms, and professional development seminars.Technical abstract:Two-dimensional (2D) layered materials are promising quantum material platforms with many important electronic properties, such as magnetism, strong electron correlation, superconductivity, and ferroelectricity. However, the interplay of ferroelectricity and other quantum properties is significantly unexplored because most current 2D quantum materials are nonpolar. Such scarcity hinders many exciting research subjects such as 2D multiferroics, dipolar Hubbard model, reconfigurable charge orderings, and superconducting diode effects. Recent discoveries of “sliding ferroelectricity” from polar stacking of nonpolar layers indicate it is possible to design ferroelectrics out of the vast majority of 2D materials with parent nonpolar compounds. The ferroelectricity can be switched via interlayer sliding, where the ultralow van der Waals sliding barrier is much smaller than that of any other ferroelectrics. The PI’s approach is to design and assemble various nonpolar 2D magnetic monolayers into polar stacking structures, where spin and charge orderings are hypothesized to be sensitive to ferroelectricity-driven stacking evolution. To fully understand the new quantum orderings and coupling physics, the research team use an in-house multimodal optical, electrical, and magnetic characterization platform to enable simultaneous access to ferroelectricity, magnetism, and electron correlation at various spatial, temporal, and energy scales. Furthermore, the PI will quantify and dynamic control of coupling strength by electrostatic doping and ultrafast light engineering. The research will advance the understanding of many-body interplay in two-dimensional quantum materials and pave the way for device applications using developed polar and Moiré 2D magnets in low-power electronics, ultrahigh-speed spintronics, and reconfigurable quantum simulation.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：该项目的重点是了解一类具有独特性质的新型量子材料（称为二维层状材料）的性质。通过对新物理进行建模、表征和工程设计，本研究旨在了解材料特性并实现对其的控制。这些材料可以为节能、高速存储器和逻辑器件以及紧凑且可编程的量子模拟器建立新平台，以满足不断增长的信息和能源需求。该项目与研究相结合，旨在促进对 STEM 的参与，重点关注历史上 STEM 领域代表性不足的群体以及威斯康星州农村地区的本科生和 K-12 教师。 PI与威斯康星大学麦迪逊分校材料研究科学与工程中心（MRSEC）教育集团和工程博览会合作组织“二维铁电体促进节能未来”教育和推广项目，包括纳米材料研究、高中课堂STEM教育活动开发以及专业发展研讨会。技术摘要：二维（2D）层状材料是有前途的量子材料平台，具有许多重要的功能。 电子特性，例如磁性、强电子相关性、超导性和铁电性。然而，铁电性和其他量子特性的相互作用尚未得到充分探索，因为当前大多数二维量子材料都是非极性的。这种稀缺性阻碍了许多令人兴奋的研究课题，例如二维多铁性、偶极哈伯德模型、可重构电荷排序和超导二极管效应。最近从非极性层的极性堆叠中发现的“滑动铁电性”表明可以用绝大多数具有非极性母体化合物的二维材料来设计铁电体。铁电性可以通过层间滑动来切换，其中超低范德华滑动势垒比任何其他铁电体都要小得多。 PI 的方法是设计各种非极性二维磁性单层并将其组装成极性堆叠结构，其中自旋和电荷排序被假设对铁电驱动的堆叠演化敏感。为了充分了解新的量子排序和耦合物理，研究团队使用内部多模态光、电和磁表征平台来同时获取不同空间、时间和能量尺度上的铁电、磁性和电子相关性。此外，PI将通过静电掺杂和超快光工程来量化和动态控制耦合强度。该研究将增进对二维量子材料中多体相互作用的理解，并为在低功耗电子、超高速自旋电子学和可重构量子模拟中使用开发的极性和莫尔二维磁体的设备应用铺平道路。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。