Emergent electronic structure and optical properties in two-dimensional materials

二维材料中的新兴电子结构和光学特性

• 批准号: RGPIN-2018-04596
• 负责人: Ye, Ziliang
• 金额: $ 2.84万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=763134
• 关键词: Emergent; electronic; structure; optical; properties; Emergent; electronic; structure; optical; properties

As a new member of the two dimensional material family, the transition metal dichalcogenide (TMDC) has attracted a lot of interest because many new fascinating physical properties start to emerge at the monolayer limit, such as a direct band gap at the edge of Brillion zone, extraordinarily intense light-matter interaction, access to the valley degree of freedom, and unusually strong Coulomb interaction with reduced screening. In the past, we have discovered a tightly bound exciton stable even at room temperature in TMDC monolayer and successfully controlled its valley coherence using ultrafast light. These extraordinary properties, together with the flexible nature of the material, have triggered tremendous interest in device applications such as flexible screens and touchpads.In this proposed program, our main focus is to explore more emergent phenomena such as the topological Moiré pattern, single photon emitter, and steady Floquet state in 2D TMDCs and related heterostructures towards quantum information applications. We are particularly interested in employing new experimental techniques such as photoinduced force microscopy, ultrafast laser with tunable pulse duration, and high-Q optical micro cavity to study TMDCs in the intense optical field with sub-diffractional spatial resolution. Within the next five years, we will investigate a series of open questions such as the formation mechanism behind the TMDC quantum dot, the impact of Moiré pattern on the optical property of TMDC heterostructures, and the thermalization process of Floquet states. Moreover, we will demonstrate some new control possibilities including the full valley pseudospin manipulation, tunable topological insulator nanostructure array, and the optical induced topologically nontrivial steady Floquet state. A new type of surface-plasmon assisted optical nearfield probe is also in our development plan.The proposed research will have a large impact in physics, material science engineering, and electrical engineering. On the one hand, our study will provide fundamental understanding of topological effects and nonequilibrium physics in solids. The deep insights obtained for TMDCs will help further improve the performance of 2D material/heterostructure based devices. On the other hand, the proposed emergent phenomena are promising to be combined with the spin and valley degrees of freedom to enable scalable quantum information processing in an integrated platform.

As a new member of the two dimensional material family, the transition metal dichalcogenide (TMDC) has attracted a lot of interest because many new fascinating physical properties start to emerge at the monolayer limit, such as a direct band gap at the edge of Brillion zone, extraordinarily intense light-matter interaction, access to the valley degree of freedom, and unusually strong Coulomb interaction with reduced screening.过去，即使在TMDC单层中的室温下，我们也发现了一个紧密绑定的令人兴奋的稳定，并使用Ultrafast Light成功控制了山谷连贯性。这些非凡的特性以及材料的灵活性引起了人们对诸如灵活屏幕和触摸板等设备应用的巨大兴趣。在此提议的程序中，我们的主要重点是探索更新兴的现象，例如拓扑模式，单个光子光子图案，单个光子光子和稳定的floquet state in 2d tmdcs和2D TMDCS和相关的量子构建额度差异，依靠质量构建量。我们特别有兴趣采用新的实验技术，例如光诱导的力显微镜，具有可调脉冲持续时间的超快激光器和高Q光学微腔内的高Q光学微腔内，以在强烈的光场中研究具有亚分为空间分辨率的强烈光场。在接下来的五年内，我们将研究一系列的开放问题，例如TMDC量子点背后的形成机制，Moiré模式对TMDC异质结构光学特性的影响以及Floquet States的热化过程。此外，我们将展示一些新的控制可能性，包括完整的Valley伪植物操纵，可调拓扑绝缘器纳米结构阵列以及光学诱导的拓扑性非平凡的稳定浮力状态。我们的开发计划中也是一种新型的表面色彩辅助光学邻近探测器。拟议的研究将对物理，材料科学工程和电气工程产生重大影响。一方面，我们的研究将提供对固体中拓扑作用和非平衡物理的基本理解。 TMDC获得的深刻见解将有助于进一步提高2D材料/异质结构设备的性能。另一方面，提出的新兴现象被承诺与旋转和山谷的自由度相结合，以在集成平台中启用可扩展的量子信息处理。