Identification of Topological Surface State in PdTe2 Superconductor by Angle-Resolved Photoemission Spectroscopy

High-resolution angle-resolved photoemission measurements are carried out on transition metal dichalcogenide PdTe2 that is a superconductor with a Tc at 1.7K. Combined with theoretical calculations, we discover for the first time the existence of topologically nontrivial surface state with Dirac con...

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Published in中国物理快报：英文版 no. 6; pp. 136 - 140
Main Author 刘艳 赵建洲 俞理 林成天 梁爱基 胡成 丁颖 徐煜 何少龙 赵林 刘国东 董晓莉 张君 陈创天 许祖彦 翁红明 戴希 方忠 周兴江
Format Journal Article
LanguageEnglish
Published 01.06.2015
Subjects
三维拓扑
电子能谱测量
表面态
角分辨光电子能谱
识别
费米能级
超导体
过渡金属
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/32/6/067303

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Summary:High-resolution angle-resolved photoemission measurements are carried out on transition metal dichalcogenide PdTe2 that is a superconductor with a Tc at 1.7K. Combined with theoretical calculations, we discover for the first time the existence of topologically nontrivial surface state with Dirac cone in PbTe2 superconductor. It is located at the Brillouin zone center and possesses helical spin texture. Distinct from the usual three-dimensional topological insulators where the Dirac cone of the surface state lies at the Fermi level, the Dirac point of the surface state in PdTe2 lies deeply below the Fermi level at - 1.75 eV binding energy and is well separated from the bulk states. The identification of topological surface state in PdTe2 superconductor deeply below the Fermi level provides a unique system to explore new phenomena and properties and opens a door for finding new topological materials in transition metal ehalcogenides.
Bibliography:LIU Yan, ZHAO Jian-Zhou, YU Li, LIN Cheng-Tian, LIANG Ai-Ji, HU Cheng, DING Ying, XU Yu , HE Shao-Long,ZHAO Lin, LIU Guo-Dong, DONG Xiao-Li, ZHANG Jun, CHEN Chuang-Tian, XU Zu-Yan, WENG Hong-Ming, DAI Xi, FANG Zhong, ZHOU Xing-Jiang（1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences Beijing 100190 ; 2 Max-Planck-Institut fur Festkorperforschung,Heisenbergstrasse 1,70569 Stuttgart,Germany; 3 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190; 4Collaborative Innovation Center of Quantum Matter, Beijing 100871）
11-1959/O4
High-resolution angle-resolved photoemission measurements are carried out on transition metal dichalcogenide PdTe2 that is a superconductor with a Tc at 1.7K. Combined with theoretical calculations, we discover for the first time the existence of topologically nontrivial surface state with Dirac cone in PbTe2 superconductor. It is located at the Brillouin zone center and possesses helical spin texture. Distinct from the usual three-dimensional topological insulators where the Dirac cone of the surface state lies at the Fermi level, the Dirac point of the surface state in PdTe2 lies deeply below the Fermi level at - 1.75 eV binding energy and is well separated from the bulk states. The identification of topological surface state in PdTe2 superconductor deeply below the Fermi level provides a unique system to explore new phenomena and properties and opens a door for finding new topological materials in transition metal ehalcogenides.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/6/067303