Photoemission Spectroscopic Evidence of Multiple Dirac Cones in Superconducting BaSn3

被引：3

作者：

Huang, Zhe ^{[1
,2
,3
]}

Shi, Xianbiao ^{[4
,5
]}

Zhang, Gaoning ^{[3
]}

Liu, Zhengtai ^{[1
]}

Cho, Soohyun ^{[1
]}

Jiang, Zhicheng ^{[1
]}

Liu, Zhonghao ^{[1
]}

Liu, Jishan ^{[1
]}

Yang, Yichen ^{[1
]}

Xia, Wei ^{[3
,6
]}

Zhao, Weiwei ^{[4
,5
]}

Guo, Yanfeng ^{[3
]}

Shen, Dawei ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Ctr Excellence Supercond Elect, Shanghai 200050, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

[3] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China

[4] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Shenzhen 518055, Peoples R China

[5] Harbin Inst Technol, Flexible Printed Elect Technol Ctr, Shenzhen 518055, Peoples R China

[6] ShanghaiTech Univ, ShanghaiTech Lab Topol Phys, Shanghai 201210, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2021年 / 38卷 / 10期

基金：

中国国家自然科学基金; 国家重点研发计划; 上海市自然科学基金;

关键词：

MAJORANA FERMIONS; ELECTRONIC-STRUCTURE; TOPOLOGICAL ORDER; BOUND-STATES; NANOWIRE; SIGNATURE;

D O I：

10.1088/0256-307X/38/10/107403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 BaSn3 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 BaSn3 is expected to be a new platform for further investigation of topological quantum materials as well as TSC.

引用

页数：6

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