报告题目：未来科技动向——在二维材料中探索操控量子自由度（Exploring and manipulating different quantum degrees of freedom in two-dimensional van der Waals materials and nano-metamaterials ）
报告人：Nai-Chang Yeh （Department of Physics & Kavli Nanoscience Institute California Institute of Technology, Pasadena, CA 91125, USA）
报告摘要：Recent advances in the development of two-dimensional (2D) atomic crystals from various van der Waals (vdW) materials have simulated intense research efforts and demonstrated great promises for a wide range of technological applications. Some of the representative vdW materials with honeycomb lattice structures include graphene, hexagonal boron nitride (h-BN), and transition metal dichalcogenides (TMDs) MX2 (where M = transition metals and X = S, Se and Te) that exhibit novel properties such as strong spin-valley coupling, superconductivity, and nontrivial topology. In this talk I will first review the unique physical properties of graphene, h-BN and TMDs that are of particular interest to nanoscale electronic, optoelectronic/valleytronic/spintronic applications, and then describe our scalable fabrication of high-quality 2D materials by means of a single-step PECVD method for monolayer graphene and bilayer graphene with controlled twist angles, and CVD method for h-BN and TMDCs. Finally, I will describe our ongoing research effort in the exploration and manipulation of different quantume degrees of freedom in these 2D materials by using light and architected nano-metastructures, and discuss our ultimate objective to advance the control and functionality of 2D materials and their heterostructures by tuning the composition, symmetry, topology, Fermi level, interface and spin-orbit-coupling of light, and by architected nano-metamaterials.