题目：具有节线边界态的四维拓扑绝缘体
4D Topological Insulators with Nodal-Line Boundary States
报告人：赵宇心  南京大学物理学院  教授
时间：2018年9月30日（周日）上午10：00
地点：大学城校区理6栋220

报告摘要
Conventional topological insulators and superconductors have topologically protected nodal points in their boundary, and the recent interests in nodal-line semimetals merely concerned bulk band structures. In this talk, we present a novel four-dimensional topological insulator protected by an anti-unitary refection symmetry, whose boundary band has a single PT-symmetric nodal line with double topological charges. Inspired by the recent experimental realization of the four-dimensional quantum hall effect, we also propose a cold-atom system which realizes the novel topological insulator with tunable parameters as extra dimensions.
References:
[1] Y. X. Zhao, A. P. Schnyder and Z. D. Wang, Phys. Rev. Lett. 116, 156402 (2016).
[2] Y. X. Zhao, Y. Lu, Phys. Rev. Lett. 118, 056401 (2017).
[3] C. Fang, Y. Chen, H.-Y. Kee, and L. Fu, Phys. Rev. B 92, 081201 (2015).
[4] L. B. Shao and Y. X. Zhao, arXiv:1805.07323.

报告人简介：赵宇心，2010年在北京大学物理系取得学士学位，2014年在香港大学物理系取得博士学位。之后，在德国马普固体物理所理论部做博士后研究，并于2017年在香港大学物理系做研究助理教授。

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