报告题目：The Advent of Two-dimensional Materials

报 告 人：张远波， 复旦大学

报告时间：2018-06-07 16:00

报告地点：理科楼郑裕彤讲堂

报告摘要：Two-dimensional (2D) atomic crystals, best exemplified by graphene, have emerged as a new class of material that may impact future science and technology. From a material physicist’s point of view, 2D materials provides vast opportunities on two fronts: First, the reduced dimensionality in these 2D crystals often leads to novel material properties that are different from those in the bulk; Second, the entire 2D crystal is a surface, so it is possible to have better control of their material properties with external perturbations. In this talk I will first illustrate these two points with two examples: black phosphorus and 1T-TaS2. These two layered materials have vastly different properties. Black phosphorus is a 2D semiconductor, and its superior material quality has recently enabled us to observe the quantum Hall effect. 1T-TaS2, on the other hand, is a metal with a rich set of charge density wave phases; we explore their electronic properties while the doping and dimensionality of the 2D systems are modulated. I will then discuss our recent results on 2D ferromagnet and high Tc superconductors.