Observation of topological Dirac fermions and surface states in superconducting BaSn3

被引：11

作者：

Huang, K. ^{[1
,2
,3
,4
]}

Luo, A. Y. ^{[5
,6
]}

Chen, C. ^{[1
,2
,7
,9
]}

Zhang, G. N. ^{[1
,2
]}

Liu, X. L. ^{[1
,2
]}

Li, Y. W. ^{[1
,2
,7
]}

Wu, F. ^{[1
,2
]}

Cui, S. T. ^{[8
]}

Sun, Z. ^{[8
]}

Jozwiak, Chris ^{[9
]}

Bostwick, Aaron ^{[9
]}

Rotenberg, Eli ^{[9
]}

Yang, H. F. ^{[1
,2
]}

Yang, L. X. ^{[10
,11
]}

Xu, G. ^{[5
,6
]}

Guo, Y. F. ^{[1
,2
]}

Liu, Z. K. ^{[1
,2
,7
]}

Chen, Y. L. ^{[1
,2
,7
,12
]}

机构：

[1] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China

[2] CAS Shanghai Sci Res Ctr, Shanghai 200031, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Shanghai 201800, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[5] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Peoples R China

[6] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China

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

[8] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China

[9] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[10] Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

[11] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[12] Univ Oxford, Dept Phys, Oxford OX1 3PU, England

来源：

PHYSICAL REVIEW B | 2021年 / 103卷 / 15期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

CHIRAL MAJORANA MODES; SEMIMETAL; DISCOVERY; ORDER;

D O I：

10.1103/PhysRevB.103.155148

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The interplay between topological electronic structure and superconductivity has attracted tremendous research interests recently as they could induce topological superconductivity (TSCs) which may be used to realize topological qubits for quantum computation. Among various TSC candidates, superconducting BaSn3 (T-c similar to 4.4 K) has been predicted to be a topological Dirac semimetal (TDS) hosting two pairs of Dirac points along the Gamma-A direction. Here, by combining the use of angle-resolved photoemission spectroscopy and ab initio calculations, we identified the predicted topological Dirac fermions and confirmed the TDS nature of the compound. In addition, we observed surface states connecting the Dirac points. Our observations demonstrate BaSn3 as a superconductor with nontrivial topological electronic structures.

引用

页数：7

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