Discovery and Fundamental Investigation of Emergent Phenomena in Novel 2D Magnets

新型二维磁体中涌现现象的发现和基础研究

• 批准号: 1904716
• 负责人: Sefaattin Tongay
• 金额: $ 50.98万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-12-01 至 2023-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1904716&HistoricalAwards=false
• 关键词: Discovery; Fundamental; Investigation; Emergent; Phenomena

Nontechnical Abstract:Magnetic materials have long been recognized for their technological importance, beginning with the compass, and are an integral part of today’s information storage and many other standard applications. However, such applications demand new magnetic materials with new properties. The recently discovered two-dimensional (2D) magnetic materials pose an immense advantage in this regard and offer a unique set of properties that are not possible with the existing magnetic materials. They measure only a few atoms in thickness, they are flexible, and better yet they can be stacked onto each other -much like Lego bricks- to form entirely new materials with new magnetic properties. The goal of this research program is to expand the library of 2D magnets employing a combination of experimental and theoretical methods. The outcome from this project benefits society by offering new magnetic materials for potential applications in data storage, quantum communication, and consumer electronics fields. The proposed multidisciplinary research program also provides an excellent training platform for undergraduate and graduate students, involves K-12 students in active research environment through the Arizona State University SCENE program, and will enable the development of new modules for existing undergraduate and graduate level courses. Technical Abstract: Two-dimensional (2D) van der Waals magnets offer unique opportunities from a fundamental as well as a technological perspective. While the first 2D material graphene was discovered back in 2004, it took more than a decade to show experimental evidence of long-range magnetic order in 2D. To date, magnetic order in 2D has been demonstrated only in a handful of materials and Curie temperatures (Tc) remain lower than 300K which is an important consideration for their disruptive impact in applications. This proposal combines advanced theoretical and experimental techniques to predict, synthesize, characterize, and manipulate the properties of entirely new-classes of 2D magnetic materials: from ferromagnetic insulators, to ferromagnetic half-metals, antiferromagnetic chiral higher order topological insulators and quantum anomalous Hall effect insulators. If successful, these studies will lay a solid foundation to create novel 2D magnets, combine topological order with magnetism in 2D, and take aggressive steps towards demonstrating the first chiral higher order topological insulators while significantly advancing our understanding of magnetism in the 2D to 3D crossover limit, and the effects of pressure, gating, and chemical substitution.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：从指南针开始，磁性材料的技术重要性早已得到认可，是当今信息存储和许多其他标准应用中不可或缺的一部分。然而，这样的应用需要具有新性能的新的磁性材料。最近发现的二维(2D)磁性材料在这方面提供了巨大的优势，并提供了现有磁性材料不可能实现的一组独特的特性。它们只测量几个原子的厚度，它们是灵活的，更好的是，它们可以相互堆叠--很像乐高积木--形成具有新磁性的全新材料。这项研究计划的目标是采用实验和理论相结合的方法来扩大2D磁体库。该项目的成果将为数据存储、量子通信和消费电子领域的潜在应用提供新的磁性材料，从而造福社会。拟议的多学科研究计划还为本科生和研究生提供了一个极好的培训平台，通过亚利桑那州立大学场景计划，让K-12学生参与积极的研究环境，并将为现有的本科生和研究生水平的课程开发新的模块。技术摘要：二维(2D)范德华磁体从基础和技术角度提供了独特的机会。虽然第一个2D材料石墨烯是在2004年发现的，但它花了十多年的时间才显示出2D中长程磁序的实验证据。到目前为止，二维磁有序只在少数材料中被证明，居里温度(TC)仍然低于300K，这是它们在应用中产生破坏性影响的一个重要考虑因素。这一提议结合了先进的理论和实验技术来预测、合成、表征和操纵全新类别的2D磁性材料的性质：从铁磁绝缘体到铁磁半金属、反铁磁手性高阶拓扑绝缘体和量子反常霍尔效应绝缘体。如果成功，这些研究将为创造新的2D磁体奠定坚实的基础，将2D中的拓扑顺序与磁性结合起来，并采取积极步骤展示第一个手性高阶拓扑绝缘体，同时显著促进我们对2D到3D交叉极限中的磁性以及压力、门控和化学替代的影响的理解。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

Nonlinear Dispersion Relation and Out‐of‐Plane Second Harmonic Generation in MoSSe and WSSe Janus Monolayers

• DOI: 10.1002/adom.202300958
• 发表时间: 2023-03
• 期刊: Advanced Optical Materials
• 影响因子: 9
• 作者: Marko M. Petrić;Viviana Villafañe;P. Herrmann;Amine Ben Mhenni;Ying Qin;Yasir Sayyad;Yuxia Shen-

Cupratelike electronic and magnetic properties of layered transition-metal difluorides from first-principles calculations

• DOI: 10.1103/physrevb.101.195116
• 发表时间: 2020-05
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Clark A. Miller;A. Botana

Second-Order Temporal Coherence of Polariton Lasers Based on an Atomically Thin Crystal in a Microcavity

基于微腔中原子薄晶体的偏振子激光器的二阶时间相干性

• DOI: 10.1103/physrevlett.131.206901
• 发表时间: 2023
• 期刊: Physical Review Letters
• 影响因子: 8.6
• 作者: Shan, Hangyong;Drawer, Jens-Christian;Sun, Meng;Anton-Solanas, Carlos;Esmann, Martin;Yumigeta, Kentaro;Watanabe, Kenji;Taniguchi, Takashi;Tongay, Sefaattin;Höfling, Sven
• 通讯作者: Höfling, Sven

Strain Anisotropy Driven Spontaneous Formation of Nanoscrolls from 2D Janus Layers

• DOI: 10.1002/adfm.202303526
• 发表时间: 2023-05
• 期刊: Advanced Functional Materials
• 影响因子: 19
• 作者: M. Sayyad;Ying Qin;J. Kopaczek;Adway Gupta;N. Patoary;S. Sinha;Emmie Benard;A. Davis;K. Y

Theory of (s+id) pairing in mixed-valent correlated metals

• DOI: 10.1103/physrevb.102.214509
• 发表时间: 2020-07
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: E. Nica;O. Erten