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

Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 138-145页

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 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China National Synchrotron Radiation Laboratory and School of Nuclear Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026China National Laboratory of Solid State Microstructures School of PhysicsNanjing UniversityNanjing 210093China School of Physics and Technology Nanjing Normal UniversityNanjing 210023China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and TechnologyWuhan 430074China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China Institute of High-Pressure Physics School of Physical Science and Technology Ningbo UniversityNingbo 315211China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Unconventional fermions in the immensely studied topological semimetals are the source for rich exotic topological ***,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 ***,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 *** 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

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Photoemission Spectroscopic Evidence of Multiple Dirac Cones in Superconducting BaSn_(3)

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Chinese Physics Letters 2021年第10期38卷 43-48页

作者： Zhe Huang Xianbiao Shi Gaoning Zhang Zhengtai Liu soohyun cho Zhicheng Jiang Zhonghao Liu Jishan Liu Yichen Yang Wei Xia Weiwei Zhao Yanfeng Guo Dawei Shen Center for Excellence in Superconducting Electronics State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Physical Science and Technology Shanghai Tech UniversityUniversityShanghai 201210 State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055China Flexible Printed Electronics Technology Center Harbin Institute of TechnologyShenzhen 518055China Shanghai Tech Laboratory for Topological Physics Shanghai Tech UniversityShanghai 201210China

Signatures of topological superconductivity(TSC)in superconducting materials with topological nontrivial states prompt intensive researches *** high-resolution angle-resolved photoemission spectroscopy and first-principles calculations,we demonstrate multiple Dirac fermions and surface states in superconductor BaSn_(3) with a critical transition temperature of about 4.4 *** predict and then unveil the existence of two pairs of type-Ⅰtopological Dirac fermions residing on the rotational ***-ⅡDirac fermions protected by screw axis are confirmed in the same *** calculation for the spin helical texture of the observed surface states originating from the Dirac fermions gives an opportunity for realization of TSC in one single *** multiple Dirac fermions and topological surface states,the intrinsic superconductor BaSn_(3) is expected to be a new platform for further investigation of topological quantum materials as well as TSC.

关键词： material topological Dirac

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