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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=687326
• 关键词: 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.

作为过渡金属二甲化合物（TMDC）的新成员，由于单层极限开始出现了许多效果，例如，在Brillion区边缘的直接频带缝隙开始出现。在过去的自由度上，我们在TMDC单层中也发现了室温，并使用这些非凡的光线和材料成功控制了其山谷在此支撑程序中，柔性屏幕和触摸板等应用是我们的主要重点是拓扑现象，例如拓扑结构，单个光子发光台和稳定的浮点子。我们特别有兴趣采用新的实验技术，例如光脉冲脉冲持续时间和高Q光学微型腔内在Inves中研究TMDC，例如在Tige年内。 DOT，Moiré模式对TMDC杂音的光学特性，以及浮子状态的热化过程。 - 一方面，Plasmon辅助了我们的开发计划。帮助进一步提高2D材料基础D设备的性能。