Molybdenum Carbide:A Stable Topological Semimetal with Line Nodes and Triply Degenerate Points

作     者：Jian-Peng Sun Dong Zhang Kai Chang 孙建鹏;张东;常凯

作者机构：SKLSMInstitute of SemiconductorsChinese Academy of SciencesBeijing 100083 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2017年第34卷第2期

页      面：83-87页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11504366 the National Basic Research Program of China under Grant Nos 2015CB921503 and 2016YFE0110000 

主　　题：Topology 

摘      要：We propose that the hexagonal crystal form of MoC is a stable and new type of topological semimetal. It hosts an exotic Fermi surface consisting of two concentric nodal rings in the presence of spin-orbit coupling, and possesses four pairs of triply degenerate points （TDPs） in the vicinity of the Fermi energy. The coexistence of the nodal ring Fermi surface and TDPs in MoC leads to extraordinary properties such as distinguishable drumhead surface states and manipulatable new fermions, which make MoC a fertile platform for in-depth understanding of topological phenomena and a potential candidate material for topological electronic devices.