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：磁性材料长期以来一直以其技术的重要性（从指南针开始）认可，并且是当今信息存储和许多其他标准应用的组成部分。但是，这种应用需要具有新特性的新磁性材料。在这方面，最近发现的二维（2D）磁性材料具有巨大的优势，并提供了一组独特的特性，而现有磁性材料则无法使用。它们仅测量厚度的几个原子，它们是柔韧性的，更好的是可以彼此堆叠 - 像乐高积木一样，形成具有新的磁性特性的全新材料。该研究计划的目的是通过实验和理论方法的组合扩展2D磁铁的库。该项目的结果通过为数据存储，量子通信和消费电子领域的潜在应用提供新的磁性材料来使社会受益。拟议的多学科研究计划还为本科和研究生提供了一个出色的培训平台，涉及通过亚利桑那州立大学现场计划在积极研究环境中的K-12学生，并将为现有的本科和研究生水平课程开发新的模块。技术摘要：二维（2D）范德华磁铁从基本和技术角度提供了独特的机会。虽然在2004年发现了第一个2D石墨烯，但在2D中显示了长距离磁性的实验证据，花了十多年的时间。迄今为止，仅在少数材料和居里温度（TC）中证明了2D中的磁顺序（TC）仍低于300K，这是它们在应用中的破坏性影响的重要考虑因素。该提议结合了先进的理论和实验技术，以预测，综合，表征和操纵完全新的2D磁性材料的特性：从铁磁绝缘子到铁磁半米，到铁磁半米，抗铁磁学高阶高阶拓扑拓扑拓扑拓扑拓扑剂和量子量子效果效果疗法疗法疗法者。如果成功，这些研究将为创建新颖的2D磁铁，将拓扑顺序与2D磁性结合起来，并采取积极的步骤来证明第一台手性高阶拓扑拓扑剂，同时显着提高我们对2D到3D交叉界限的磁性的理解，并通过压力，进行批准，并以Internitive的效果来反映nsf的效果。优点和更广泛的影响审查标准。

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

Anomalous Behavior of 2D Janus Excitonic Layers under Extreme Pressures

• DOI: 10.1002/adma.202002401
• 发表时间: 2020-07-06
• 期刊: ADVANCED MATERIALS
• 影响因子: 29.4
• 作者: Li, Han;Qin, Ying;Tongay, Sefaattin
• 通讯作者: Tongay, Sefaattin

Visualizing the out-of-plane electronic dispersions in an intercalated transition metal dichalcogenide

• DOI: 10.1103/physrevb.105.l121107
• 发表时间: 2022-03
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Xian P. Yang;H. LaBollita;Zi-Jia Cheng;H. Bhandari;T. Cochran;Jia-Xin Yin;M. S. Hossain;I. Belopolski;Qi Zhang;Yu-Xiao Jiang;N. Shumiya;Daniel Multer;Maksim Liskevich;D. Usanov;Yanliu Dang;V. Strocov;A. Davydov;N. Ghimire;A. Botana;M. Z. Hasan

Tunable magnetic and optical properties of transition metal dihalides by cation alloying

• DOI: 10.1103/physrevmaterials.6.084003
• 发表时间: 2022-08
• 期刊: Physical Review Materials
• 影响因子: 3.4
• 作者: Mark Blei;Jesse Kapeghian;Rounak Banerjee;P. Kolari;Blake Povilus;Y. Attarde;A. Botana;S. Tongay