Collaborative Research: Correlated States in Twisted Hetero-bilayer Transition Metal Dichalcogenides

合作研究：扭曲异双层过渡金属二硫属化物中的相关态

• 批准号: 2104805
• 负责人: Yongtao Cui
• 金额: $ 27.5万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-06-01 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2104805&HistoricalAwards=false
• 关键词: Collaborative; Research; Correlated; States; Twisted

Nontechnical Abstract: In conventional materials, electrons travel in the periodic arrays of atoms without "talking" (interacting) to each other. When two monolayers of atomically thin materials, also knowns as two-dimensional (2D) materials, are stacked together with a well-controlled twist angle between these two layers, they form a new periodic structure with interesting properties. In this collaborative project, the PIs investigate these 2D materials to gain knowledge that could enable transformative technology innovations such as high-temperature superconductivity, quantum electronics and optoelectronics. This project integrates an education component to train students and build a strong workforce for quantum science and technologies. Under-represented groups are particularly encouraged and included in the education programs.Technical Abstract: Correlated states such as Mott insulators and Wigner crystals remain intriguing subjects of physics. More recently, twisted hetero-bilayer transition metal dichalcogenides (TMDs) have emerged as a new platform with even more enhanced correlation strength, and their strong spin-orbit coupling and presence of bandgaps provide new avenues to explore spin-related physics and optoelectronics in correlated states. In this collaborative proposal, the PIs explore the moiré superlattices formed by twisted hetero-bilayer TMDs. The research plan includes two main thrusts. Thrust I is to characterize the interaction strength of the correlated states and study its relationship with moiré structure parameters and external controls to manipulate the correlated states. Thrust II is to explore new correlated states arising from interactions with other electronic phases, such as the interplay of correlated states with Landau levels, the effect of strong correlation on valley physics and excitonic physics of the moiré superlattice, and other types of new states that could possibly arise in this strongly interacting system. The collaborative project trains graduate and undergraduate students are trained for future placement in quantum science and technologies. The project also creates research modules for outreach to K-12 students and actively involves under-represented groups.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：在传统材料中，当两个单层原子薄材料（也称为二维 (2D) 材料）与一个原子堆叠在一起时，电子在原子的周期性阵列中移动，而不会相互“交谈”（相互作用）。这两层之间的扭曲角度受到良好控制，它们形成了一种具有有趣特性的新周期性结构。在这个合作项目中，PI 研究这些二维材料以获得能够实现变革性技术创新的知识，例如。该项目整合了教育内容，以培训学生并为量子科学和技术培养一支强大的劳动力队伍。技术摘要：相关陈述如下。由于莫特绝缘体和维格纳晶体仍然是物理学中有趣的课题，最近，扭曲的异质双层过渡金属二硫属化物（TMD）已成为一种具有更强相关性的新平台。强度、强自旋轨道耦合和带隙的存在为探索相关态的自旋相关物理和光电子学提供了新的途径。在这项合作提案中，PI 探索了由扭曲异质双层 TMD 形成的莫尔超晶格。包括两个主要主旨。主旨一是表征相关态的相互作用强度，并研究其与莫尔结构参数和外部控制的关系，以操纵相关态。主旨二是探索新的相关态。与其他电子相相互作用产生的态，例如具有强朗道能级的相关态的相互作用、强相关性对莫尔超晶格的谷物理和激子物理的影响，以及在这种相互作用中可能出现的其他类型的新态该合作项目为研究生和本科生提供未来量子科学和技术方面的培训。该项目还创建了面向 K-12 学生的研究模块，并积极让代表性不足的群体参与其中。该奖项反映了 NSF 的法定使命，并具有被认为值得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来获得支持。

项目成果

Tuning moiré excitons and correlated electronic states through layer degree of freedom

通过层自由度调节莫尔激子和相关电子态

• DOI: 10.1038/s41467-022-32493-9
• 发表时间: 2022-08
• 期刊: Nature Communications
• 影响因子: 16.6
• 作者: Chen, Dongxue;Lian, Zhen;Huang, Xiong;Su, Ying;Rashetnia, Mina;Yan, Li;Blei, Mark;Taniguchi, Takashi;Watanabe, Kenji;Tongay, Sefaattin;et al
• 通讯作者: et al

Excitonic insulator in a heterojunction moiré superlattice

异质结莫尔超晶格中的激子绝缘体

• DOI: 10.1038/s41567-022-01703-y
• 发表时间: 2022-10
• 期刊: Nature Physics
• 影响因子: 19.6
• 作者: Chen, Dongxue;Lian, Zhen;Huang, Xiong;Su, Ying;Rashetnia, Mina;Ma, Lei;Yan, Li;Blei, Mark;Xiang, Li;Taniguchi, Takashi;et al
• 通讯作者: et al