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: 2104902
• 负责人: Sufei Shi
• 金额: $ 28.13万
• 依托单位: Rensselaer Polytechnic Institute
• 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=2104902&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：在常规材料中，电子设备在原子的周期性阵列中行进，而无需“说话”（交互）。当两个原子薄的材料（也称为二维（2D）材料）与这两层之间的良好控制的扭曲角一起堆叠时，它们形成具有有趣特性的新定期结构。在这个合作项目中，PIS调查了这些2D材料，以获得可以实现变革性技术创新（例如高温超导性，量子电子和光电子）等知识。该项目集成了一个教育部分，以培训学生并为量子科学和技术建立强大的劳动力。特别鼓励代表性不足的群体，并包括在教育计划中。技术摘要：相关状态，例如Mott绝缘子和Wigner Crystals，仍然吸引了物理学的知名度。最近，扭曲的异质双层过渡金属二盐元化（TMD）已成为一个具有更高相关强度增强的新平台，它们的强旋转轨道耦合和带盖的存在提供了新的途径，可探索与旋转相关的物理学和互相关状态的旋转相关物理学和光电。在这个合作提议中，PIS探索了由扭曲的异性恋TMD形成的Moiré超晶格。该研究计划包括两个主要的势头，是表征相关状态的相互作用强度，并研究其与Moiré结构参数和外部控制的关系以操纵相关状态。 Thrust II是探索与其他电子相互作用引起的新的相关状态，例如相关状态与Landau水平的相互作用，强相关对山谷物理学的影响以及Moiré超级晶格的令人兴奋的物理学以及在这种强烈相互作用的系统中可能会出现的其他新状态。协作项目培训毕业生和本科生将接受量子科学和技术的未来培训。该项目还为向K-12学生提供宣传的研究模块，并积极涉及代表性不足的小组。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，认为值得通过评估来获得支持。