Conservation of the particle-hole symmetry in the pseudogap state in optimally-doped Bi2Sr2CuO6+δ superconductor
Hongtao Yan(闫宏涛)1,2, Qiang Gao(高强)1, Chunyao Song(宋春尧)1,2, Chaohui Yin(殷超辉)1,2, Yiwen Chen(陈逸雯)1,2, Fengfeng Zhang(张丰丰)3, Feng Yang(杨峰)3, Shenjin Zhang(张申金)3, Qinjun Peng(彭钦军)3, Guodong Liu(刘国东)1,2,4, Lin Zhao(赵林)1,2,4, Zuyan Xu(许祖彦)3, and X. J. Zhou(周兴江)1,2,4,5,†
1 National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China; 4 Songshan Lake Materials Laboratory, Dongguan 523808, China; 5 Beijing Academy of Quantum Information Sciences, Beijing 100193, China
Abstract The pseudogap state is one of the most enigmatic characteristics in the anomalous normal state properties of the high temperature cuprate superconductors. A central issue is to reveal whether there is a symmetry breaking and which symmetries are broken across the pseudogap transition. By performing high resolution laser-based angle-resolved photoemission measurements on the optimally-doped Bi2Sr1.6La0.4CuO6+δ superconductor, we report the observations of the particle-hole symmetry conservation in both the superconducting state and the pseudogap state along the entire Fermi surface. These results provide key insights in understanding the nature of the pseudogap and its relation with high temperature superconductivity.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11888101, 11922414 and 11974404), the National Key Research and Development Program of China (Grant Nos. 2021YFA1401800, 2017YFA0302900, 2018YFA0305602, and 2018YFA0704200), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant Nos. XDB25000000 and XDB33000000), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2021006), the Synergetic Extreme Condition User Facility (SECUF) and the Research Program of Beijing Academy of Quantum Information Sciences (Grant No. Y18G06).
Corresponding Authors:
X. J. Zhou
E-mail: XJZhou@iphy.ac.cn
Cite this article:
Hongtao Yan(闫宏涛), Qiang Gao(高强), Chunyao Song(宋春尧), Chaohui Yin(殷超辉), Yiwen Chen(陈逸雯), Fengfeng Zhang(张丰丰), Feng Yang(杨峰), Shenjin Zhang(张申金), Qinjun Peng(彭钦军), Guodong Liu(刘国东), Lin Zhao(赵林), Zuyan Xu(许祖彦), and X. J. Zhou(周兴江) Conservation of the particle-hole symmetry in the pseudogap state in optimally-doped Bi2Sr2CuO6+δ superconductor 2022 Chin. Phys. B 31 087401
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