各位老师，您好：
我们很荣幸邀请到牛津大学陈宇林教授来访问微结构国家实验室。陈宇林教授将在29号上午10点在唐仲英楼B501，作题为：“Visualizing Electronic Structures of “3D graphenes””的邀请报告，欢迎您和您的学生前来交流。
报告摘要如下：
Visualizing Electronic Structures of “3D graphenes”
Yulin Chen
Physics Department, University of Oxford
The discovery of materials with novel properties is one of the most fascinating aspects of physics, and such findings have always played important roles in the development of science and human life. Two recent examples are graphene and topological insulators. Interestingly, both materials possess 2D Dirac fermions; and topological insulators further show distinct topology in their electronic band structures. With the swift development in both fields, two questions have been naturally raised:
i). Does there exist a 3D counterpart of graphene, or a “3D graphene”?
ii). Besides topological insulators, can one find other materials that have unusual topology in their electronic structures?
Remarkably, the answer to both questions can lie on a same type of novel quantum matter – the topological semi-metals - which not only processes 3D Dirac or Weyl fermions in the bulk (in contrast to the 2D Dirac fermions in graphene and topological insulators), but also shows unique surface states result from its non-trivial topology of the bulk electronic structure.
In this talk, I will show that by using advanced photoemission spectroscopy with high energy, momentum, and time resolution, we were able to directly visualize the non-trivial electronic structures and unusual dynamics in topological insulators and topological semi-metals recently discovered. Finally, I will briefly discuss the application potentials of these unusual materials.
