Quantum gases in moiré-ordered and reconstructed heterostructures: effective dimensionalities, hybrid states, and interactions

莫尔有序和重构异质结构中的量子气体：有效维度、混合态和相互作用

• 批准号: 443405595
• 负责人: Professor Dr. Alexey Chernikov
• 金额: --
• 依托单位: Institut für Angewandte Physik (IAP)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/443405595?language=en
• 关键词: Quantum; gases; moir; ordered; reconstructed

Van der Waals heterostructures of twisted or lattice-mismatched two-dimensional transition metal dichalcogenides emerged as rich and versatile platforms for optical studies of many-particle and correlated electron physics. These types of phenomena depend sensitively on the specific material configurations, including lattice and angular mismatch leading to the formation of moiré-superlattices or locally and mesoscopically reconstructed domains. While offering a high level of flexibility and tunability for the design of the electronic many-particle states, it also demands accurate descriptions of the underlying fundamental processes. This motivates the main goal of this project to develop comprehensive understanding of the many-body physics in semiconducting van der Waals heterostructures governing their optical response across linear and non-linear regimes. We will address a broad range of density conditions for both bosonic and fermionic types of quasiparticles, such as excitons or electron-hole plasma and their mixtures. Specifically, we aim to understand the impact of dimensionality from effectively two-, one-, and zero-dimensional domains in reconstructed heterostructures on the dynamics and transport of optical excitations, using a unified material platform for all relevant quantum confinement regimes from low to high densities. In addition, we will create and control hybrid, interacting moiré exciton states combining strong exciton-exciton and exciton-photon interactions towards tunable dipolar polaritonics. Finally, we plan to develop experimental and theoretical approaches to externally manipulate both the strength and sign of the exciton-exciton interactions from repulsive to attractive, as well as crossing the border between pure Bose and Fermi gases to trigger formation of distinct many-body phases on demand. To address these goals, we will combine state-of-the art sample fabrication techniques with advanced experimental methods including hyperspatial and magneto-spectroscopy, ultrafast transient microscopy, and structural characterization, as well as microscopic many-body theory of electronic and optical properties up to high density regimes. Ultimately it will allow us to address topical questions on the forefront of a rapidly growing research field towards key scientific and technological advances in the broad area of two-dimensional van der Waals heterostructures.

扭曲或晶格失配的二维过渡金属二硫属化物的货车德瓦耳斯异质结构成为多粒子和相关电子物理的光学研究的丰富和通用的平台。这些类型的现象敏感地依赖于特定的材料配置，包括晶格和角度失配，导致形成莫尔超晶格或局部和介观重构域。虽然为电子多粒子态的设计提供了高度的灵活性和可调性，但它也需要对基本过程的准确描述。这激发了本项目的主要目标，以发展在半导体货车德瓦耳斯异质结构的多体物理学的全面理解，他们的光学响应跨越线性和非线性制度。我们将讨论玻色子和费米子类型的准粒子，如激子或电子空穴等离子体及其混合物的广泛的密度条件。具体来说，我们的目标是了解有效的二维，一维和零维域重建异质结构的动力学和光激发的运输的维度的影响，使用统一的材料平台，从低到高密度的所有相关的量子限制制度。此外，我们将创建和控制混合，相互作用的莫尔激子态结合强激子-激子和激子-光子相互作用对可调偶极极化激元。最后，我们计划开发实验和理论方法来外部操纵激子-激子相互作用的强度和符号，从排斥到吸引，以及跨越纯玻色和费米气体之间的边界，以触发形成不同的多体相的需求。为了实现这些目标，我们将结合联合收割机国家的最先进的样品制造技术与先进的实验方法，包括超空间和磁光谱，超快瞬态显微镜，和结构表征，以及微观多体理论的电子和光学性能高密度制度。最终，它将使我们能够解决热点问题的前沿迅速增长的研究领域的关键科学和技术的进步，在广泛的二维货车德瓦尔斯异质结构。