报告题目：Dirac surface state in topological crystalline insulators

报告人：Wei-Feng Tsai (蔡维枫), Assistant Professor （National Sun Yat-sen University, Kaohsiung）

邀请人：周雨青 教授

时间：4月1日（周三） 上午10:30

地点：田家炳楼南203会议室

摘要：Topological insulators belong to a new phase of matter with their topological nature protected by time reversal symmetry. Since their discovery condensed matter physicists have made enormous effort in the manipulation and possible application of them as well as a hunt for new materials with non-trivial topology, including topological superconductors. However, recently discovered topological crystalline insulators, Pb_1-xSn_x(Te, Se), can harbor multiple Dirac surface states, which are protected by a discrete set of crystalline symmetries rather than time reversal symmetry. In this talk, I will compare the physical properties of these materials with those in topological insulators. In particular, the new possibilities opened by the presence of the multiple Dirac surface states will be discussed through concrete examples.

报告人简介：

蔡维枫，2008年博士毕业于美国加州大学洛杉矶分校，在普渡大学（2008-2010）和东京大学（2010-2011）的博士后研究之后，于2011年加入台湾高雄中山大学物理系，现为该系助理教授。蔡维枫教授的研究领域为理论凝聚态物理，目前的研究兴趣集中在强关联电子系统、非常规超导体、拓扑绝缘体和拓扑超导体、纳米结构中的输运以及冷原子系统。迄今在Nature Communications, Nature Physics, Science等刊物上发表论文多篇。