| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Angle-resolved photoemission study of NbGeSb with non-symmorphic symmetry |
| Huan Ma(马欢)1,2, Ning Tan(谭宁)1,2, Xuchuan Wu(吴徐传)1,2, Man Li(李满)3, Yiyan Wang(王义炎)4, Hongyan Lu(路洪艳)5,†, Tianlong Xia(夏天龙)1,2,‡, and Shancai Wang(王善才)1,2,§ |
1 Department of Physics, Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education), Renmin University of China, Beijing 100872, China;
2 Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-Nano Devices, Renmin University of China, Beijing 100872, China;
3 School of Information Network Security, People's Public Security University of China, Beijing 100038, China;
4 Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China;
5 School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China |
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Abstract We investigate the electronic structure of NbGeSb with non-symmorphic symmetry. We employ angle-resolved photoemission spectroscopy (ARPES) to observe and identify the bulk and surface states over the Brillouin zone. By utilizing high-energy photons, we identify the bulk Fermi surface and bulk nodal line along the direction $X$-$R$, while the Fermi surface of the surface state is observed by using low-energy photons. We observe the splitting of surface bands away from the high-symmetry point $\overline{{X}}$. The density functional theory calculations on bulk and 1 to 5-layer slab models, as well as spin textures of NbGeSb, verify that the band splitting could be attributed to the Rashba-like spin-orbit coupling caused by space-inversion-symmetry breaking at the surface. These splitted surface bands cross with each other, forming two-dimensional Weyl-like crossings that are protected by mirror symmetry. Our findings provide insights into the two-dimensional topological and symmetry-protected band inversion of surface states.
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Received: 22 September 2023
Revised: 13 November 2023
Accepted manuscript online: 16 November 2023
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PACS:
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71.20.-b
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(Electron density of states and band structure of crystalline solids)
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79.60.-i
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(Photoemission and photoelectron spectra)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFA1403803). H. M. is supported by the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (Grant No. 22XNH099). The results of DFT calculations described in this paper are supported by HPC Cluster of ITP-CAS. M. L. is supported by the National Natural Science Foundation of China (Grant No. 12204536), the Fundamental Research Funds for the Central Universities, and the Research Funds of People’s Public Security University of China (PPSUC) (Grant No. 2023JKF02ZK09). T. L. X. is supported by the National Key R&D Program of China (Grant No. 2019YFA0308602) and the National Natural Science Foundation of China (Grant Nos. 12074425 and 11874422). Y. Y. W. is supported by the National Natural Science Foundation of China (Grant No. 12104011). H. Y. L. is supported by the National Natural Science Foundation of China (Grant No. 12074213), the Major Basic Program of Natural Science Foundation of Shandong Province (Grant No. ZR2021ZD01), and the Project of Introduction and Cultivation for Young Innovative Talents in Colleges and Universities of Shandong Province. |
Corresponding Authors:
Hongyan Lu, Tianlong Xia, Shancai Wang
E-mail: hylu@qfnu.edu.cn;tlxia@ruc.edu.cn;scw@ruc.edu.cn
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Cite this article:
Huan Ma(马欢), Ning Tan(谭宁), Xuchuan Wu(吴徐传), Man Li(李满), Yiyan Wang(王义炎), Hongyan Lu(路洪艳), Tianlong Xia(夏天龙), and Shancai Wang(王善才) Angle-resolved photoemission study of NbGeSb with non-symmorphic symmetry 2024 Chin. Phys. B 33 027102
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