Photoemission Spectroscopic Evidence of Multiple Dirac Cones in Superconducting BaSn$_3$
Zhe Huang1,2,3 , Xianbiao Shi4,5 , Gaoning Zhang3 , Zhengtai Liu1 , Soohyun Cho1 , Zhicheng Jiang1 , Zhonghao Liu1 , Jishan Liu1* , Yichen Yang1 , Wei Xia3,6 , Weiwei Zhao4,5 , Yanfeng Guo3* , and Dawei Shen1,2*
1 Center for Excellence in Superconducting Electronics, State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China3 School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China4 State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Shenzhen 518055, China5 Flexible Printed Electronics Technology Center, Harbin Institute of Technology, Shenzhen 518055, China6 ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China
Abstract ：Signatures of topological superconductivity (TSC) in superconducting materials with topological nontrivial states prompt intensive researches recently. Utilizing high-resolution angle-resolved photoemission spectroscopy and first-principles calculations, we demonstrate multiple Dirac fermions and surface states in superconductor BaSn$_3$ with a critical transition temperature of about 4.4 K. We predict and then unveil the existence of two pairs of type-I topological Dirac fermions residing on the rotational axis. Type-II Dirac fermions protected by screw axis are confirmed in the same compound. Further calculation for the spin helical texture of the observed surface states originating from the Dirac fermions gives an opportunity for realization of TSC in one single material. Hosting multiple Dirac fermions and topological surface states, the intrinsic superconductor BaSn$_3$ is expected to be a new platform for further investigation of topological quantum materials as well as TSC.
收稿日期: 2021-07-14
Editors Suggestion
出版日期: 2021-09-26
:
74.25.Jb
(Electronic structure (photoemission, etc.))
71.20.-b
(Electron density of states and band structure of crystalline solids)
71.18.+y
(Fermi surface: calculations and measurements; effective mass, g factor)
引用本文:
. [J]. 中国物理快报, 2021, 38(10): 107403-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/38/10/107403
或
https://cpl.iphy.ac.cn/CN/Y2021/V38/I10/107403
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2021, Vol. 38 
