Transition-metal dichalcogenide heterostructures as a robust, tunable platform for studying exciton-exciton interactions

过渡金属二硫属化物异质结构作为研究激子-激子相互作用的稳健、可调平台

• 批准号: 398761088
• 负责人: Professor Dr. Tobias Korn
• 金额: --
• 依托单位: Institut für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/398761088?language=en
• 关键词: Transition; metal; dichalcogenide; heterostructures; robust

The goal of this project is to establish transition-metal dichalcogenide heterostructures (TMDC-HS) as a robust, tunable platform for studying interlayer excitons and their interactions. Due to their bosonic nature, excitons have a rich phase diagram as a function of temperature and density. Interlayer excitons in TMDC-HS offer several advantages over more established, GaAs-based heterostructures, including significantly larger exciton binding energies, the novel valley degree of freedom and design parameters such as the relative orientation of adjacent monolayers. However, they also present challenges which stem from their sensitivity to the environment, leading to pronounced inhomogeneous broadening that is much larger than in high-quality GaAs heterostructures. We propose to optimize the fabrication of TMDC-HS using encapsulation in other two-dimensional materials (e.g. hexagonal Boron Nitride), and to integrate nanostructured electrodes which define electrostatic traps for exciton confinement. We shall utilize various optical spectroscopy techniques to characterize these novel structures and to investigate the dynamics of interlayer excitons in the regime of high densities and low temperatures.

该项目的目的是建立过渡金属二色元异化异质结构（TMDC-HS），作为研究中层激体及其相互作用的健壮，可调的平台。由于其骨性质，激子具有丰富的相图作为温度和密度的函数。 TMDC-HS中的层间激子比更建立的基于GAAS的异质结构（包括明显更大的激子结合能，新型的自由度和设计参数），例如相邻单层的相对方向，提供了几个优点。但是，它们还提出了源于对环境的敏感性的挑战，导致明显的不均匀扩展，比高质量的GAAS异质结构大得多。我们建议使用其他二维材料（例如六边形氮化物）中的封装来优化TMDC-HS的制造，并整合纳米结构的电极，该电极定义了静电堆的静电堆。我们将利用各种光谱技术来表征这些新型结构，并研究高密度和低温方向上层中激子的动力学。