CAREER: Correlated Excitons in Semiconducting Moire Superlattices

职业：半导体莫尔超晶格中的相关激子

• 批准号: 2337606
• 负责人: CHENHAO JIN
• 金额: $ 75.03万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-04-01 至 2029-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2337606&HistoricalAwards=false
• 关键词: CAREER; Correlated; Excitons; Semiconducting; Moire

Non-technical abstract:Fundamental particles can be classified into fermions and bosons, which have distinct collective behaviors. Interactions between electrons, a fermion, results in now well known emergent properties. On the other hand, creation of unconventional bosonic matter has been challenging since bosons in natural materials are often weakly-interacting and/or short-lived. This project bridges this gap by creating unconventional bosonic matter using excitons in semiconducting moiré superlattices. Compared to existing platforms such as cold atoms and quantum wells, this platform offers orders-of-magnitude higher temperature scale (tens of Kelvin vs. 1 Kelvin) and scalability (10000 particles vs. ~100 particles). Research is incorporated into a broad outreach plan under the theme of “Science as a Lego game”. Leveraging the Lego-like nature of optical setups, integrated outreach activities are targeted at students at many educational levels to demystify quantum science and introduce them to potential career options. Specific activities include designing a high-school lab-based class series on building optical modules and a Saturday class on optics in quantum science; initiating a summer research intern program for undergraduate students; and organizing a quantum science summer school for graduate students and postdocs.Technical abstract:Condensed matter physics aims to understand how interactions endow simple elementary particle building blocks with complex emergent phenomena. Exotic quantum phases of fermionic electrons have been intensively studied in solid-state systems, including recently in moiré superlattices. However, collective bosonic states have remained the purview of ultra-cold atoms due to the lack of suitable condensed matter platforms and experimental probes. This project aims to overcome both challenges and establishe excitons in semiconducting moiré superlattices -- bosons composed of tightly bound electron-hole pairs -- as a platform for engineering exotic collective states of interacting bosons. The principal investigator is developing a set of novel pump- probe spectroscopies that enables direct measurement of exciton compressibility, isolating low energy “charge” and “spin” excitations of excitons, as well as investigating their dynamics. This allows identification and investigation of a plethora of exotic bosonic phases such as bosonic Wigner crystal, Mott-superfluid transition, valley pseudospin exchange interactions and pseudospin orders, etc. This project forges a path to a new class of “quantum exitonic materials” where exotic properties and novel device concepts arise from strongly correlated bosons, thereby establishing a new fundamental pillar of condensed matter alongside the extensively studied quantum electronic materials.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：基本颗粒可以分为具有不同集体行为的费米和玻色子。电子（一种费用）之间的相互作用导致现在众所周知的新兴特性。另一方面，由于天然材料中的玻色子通常是微弱的和/或短暂的，因此对非常规的骨气物质的产生受到了挑战。该项目通过在半导体的Moiré超级晶格中使用激子创建非常规骨值来弥合这一差距。与现有平台（例如冷原子和量子井）相比，该平台提供了较高的温度尺度（Kelvin vs. 1 Kelvin）和可伸缩性（10000个颗粒与〜100颗粒）。在“乐高游戏科学”的主题上，研究将研究纳入了广泛的外展计划中。利用光学设置的乐高般的性质，集成的外展活动针对许多教育水平的学生，以揭开量子科学的神秘感，并将其介绍给潜在的职业选择。特定的活动包括设计有关构建光学模块的基于高中实验室的课程和量子科学光学的周六课程；为本科生启动夏季研究实习生计划；并组织一所量子科学暑期学校，为研究生和博士后。技术摘要：凝结物理物理学旨在了解相互作用如何赋予简单的基本粒子构建块具有复杂的新兴现象。费米文化电子产品的外来量子阶段已经在固态系统中进行了大量研究，包括最近在Moiré超晶格中。但是，由于缺乏合适的冷凝物质平台和实验性问题，集体骨状状态仍然是超冷原子的权限。该项目旨在克服挑战，并在半导体的Moiré超晶格（由紧密绑定的电子孔对组成）中建立激子，作为工程异国情调的相互作用玻色子的平台。首席研究者正在开发一组新型的泵探针光谱，该光谱可以直接测量激子依从性，隔离激发激动的低能“电荷”和“自旋”，并研究其动力学。这允许鉴定和研究多种奇异的纤维阶段，例如玻色粒晶体晶体，Mott-Superfluid过渡，Valley pseudospin交流相互作用和伪季命令等。该项目为“量子和新型设备概念”的新量子构建了一类新的“量子和新型材料”的途径。与广泛研究的量子电子材料一起凝结的物质。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，被认为是值得的支持。