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Experimental observation of multiple topological nodal structure in LaSb2

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Abstract

Unconventional fermions in the immensely studied topological semimetals are the source for rich exotic topological properties. Here, using symmetry analysis and first-principles calculations, we propose the coexistence of multiple topological nodal structure in LaSb2, including topological nodal surfaces, nodal lines and in particular eightfold degenerate nodal points, which have been scarcely observed in a single material. Further, utilizing angle-resolved photoemission spectroscopy, we confirm the existence of nodal surfaces and eightfold degenerate nodal points in LaSb2. The intriguing multiple topological nodal structure might play a crucial role in giving rise to the large linear magnetoresistance. Our work renews the insights into the exotic topological phenomena in LaSb2.

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China

    Yuxi Qiao, Zhicheng Jiang, Zhengtai Liu, Soohyun Cho, Fayuan Zhang, Yichen Yang, Zhe Huang, Jishan Liu & Shan Qiao

  2. National Synchrotron Radiation Laboratory, and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230026, China

    Yuxi Qiao, Zhengtai Liu, Jishan Liu & Shan Qiao

  3. National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, 210093, China

    Fuyi Wang & Haijun Zhang

  4. School of Physics and Technology, Nanjing Normal University, Nanjing, 210023, China

    Huaiqiang Wang

  5. School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China

    Zicheng Tao, Wei Xia, Zhe Huang, Shan Qiao & Yanfeng Guo

  6. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China

    Zhengtai Liu & Jishan Liu

  7. Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China

    Fayuan Zhang

  8. Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China

    Qingkai Meng & Zengwei Zhu

  9. ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai, 201210, China

    Wei Xia & Yanfeng Guo

  10. Institute of High-Pressure Physics & School of Physical Science and Technology, Ningbo University, Ningbo, 315211, China

    Zhonghao Liu

  11. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China

    Haijun Zhang

  12. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

    Dawei Shen

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  1. Yuxi Qiao
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Corresponding authors

Correspondence to Huaiqiang Wang, Yanfeng Guo, Haijun Zhang or Dawei Shen.

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Additional information

This work was supported by the National Key R&D Program of China (Grant No. 2023YFA1406304), the National Natural Science Foundation of China (Grant Nos. U2032208, 12222413, 11874264, 12074181, 11834006, and 12104217), and the Natural Science Foundation of Shanghai (Grant Nos. 23ZR1482200, 22ZR1473300, and 14ZR1447600). Yanfeng Guo acknowledges the Shanghai Science and Technology Innovation Action Plan (Grant No. 21JC1402000), the Open Projects from State Key Laboratory of Functional Materials for Informatics (Grant No. SKL2022), and the Double First-Class Initiative Fund of ShanghaiTech University. Jishan Liu thanks the fund of Science and Technology on Surface Physics and Chemistry Laboratory (Grant No. 6142A02200102). Part of this research used Beamline 03U of the Shanghai Synchrotron Radiation Facility, which is supported by ME2 Project (Grant No. 11227902) from the National Natural Science Foundation of China. Haijun Zhang is supported by the National Key Projects for Research and Development of China (Grant No. 2021YFA1400400), the Fundamental Research Funds for the Central Universities (Grant No. 020414380185), the Natural Science Foundation of Jiangsu Province (Grant No. BK20200007), and the Fok Ying-Tong Education Foundation of China (Grant No. 161006). We thank Dexi Shao and Gang Mu for the useful discussion.

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Qiao, Y., Wang, F., Wang, H. et al. Experimental observation of multiple topological nodal structure in LaSb2. Sci. China Phys. Mech. Astron. 67, 247411 (2024). https://doi.org/10.1007/s11433-023-2320-7

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