报告题目：Honeycomb Lattice and Topology

报 告 人:  胡 晓 博士日本国立物质材料研究机构(NIMS)

世界顶级计划材料纳米结构学研究中心主任研究员 筑波大学教授

报告时间：10月12日下午1：30-2：30

报告地点：物理科技楼101室

报告摘要：Honeycomb lattice supports Dirac-type dispersions, a feature important for achieving nontrivial topology. Haldane was the first to derive the quantum anomalous Hall effect by introducing the staggered flux associated with the next-nearest neighbor (NNN) hopping into the tight-bind model, and Kane-Mele discovered the quantum spin Hall effect noticing that the spin-orbital coupling emerges from the NNN hopping. Recently we have revealed that a topological state can be achieved upon tuning the strength of nearest-neighbor (NN) hopping energy on honeycomb lattice. This may open a new way to drive graphene into a topological state protected by a large energy gap. I will also discuss the application of this idea to electromagnetic systems, which makes pure-silicon topological photonics possible.

报告人简介：胡晓教授从事理论物理研究，曾先后在日本东京大学、东北大学、美国国家标准技术研究所(NIST)等研究机构从事教学科研工作。1996年加盟日本国立物质材料研究机构。他在铜氧化物高温超导Abrikosov磁通格子的融化相变，本征约瑟夫森结THz电磁波辐射，拓扑超导马约纳拉準粒子探索，新奇拓扑光子晶体和拓扑绝缘体的理论设计等研究领域取得了一系列重要成果。至今已在Superconductor Science and Technology，Advanced Materials，Advances in Physics等重要期刊发表综述文章。