Experimental observation of multiple topological nodal structure in LaSb_(2)  

作　　者：Yuxi Qiao Fuyi Wang Huaiqiang Wang Zicheng Tao Zhicheng Jiang Zhengtai Liu Soohyun Cho Fayuan Zhang Qingkai Meng Wei Xia Yichen Yang Zhe Huang Jishan Liu Zhonghao Liu Zengwei Zhu Shan Qiao Yanfeng Guo Haijun Zhang Dawei Shen 

机构地区：[1]State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China [2]National Synchrotron Radiation Laboratory,and School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China [3]National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210093,China [4]School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China [5]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [6]Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China [7]Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [8]Wuhan National High Magnetic Field Center and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China [9]ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China [10]Institute of High-Pressure Physics School of Physical Science and Technology,Ningbo University,Ningbo 315211,China [11]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [12]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第4期138-145,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：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);the Natural Science Foundation of Shanghai(Grant Nos.23ZR1482200,22ZR1473300,and 14ZR1447600);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);the Double First-Class Initiative Fund of Shanghai Tech University;the fund of Science and Technology on Surface Physics and Chemistry Laboratory(Grant No.6142A02200102);supported by ME2Project(Grant No.11227902)from the National Natural Science Foundation of China;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);the Fok Ying-Tong Education Foundation of China(Grant No.161006)。

摘　　要：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 LaSb_(2),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 LaSb_(2).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 LaSb_(2).

关 键 词：eightfold degenerate points multiple topological nodal structure angle-resolved photoemission spectroscopy linear unsaturated magnetoresistance 

分 类 号：O469[理学—凝聚态物理]