Common ($\pi$,$\pi$) Band Folding and Surface Reconstruction in FeAs-Based Superconductors
Yongqing Cai1,2†, Tao Xie1†, Huan Yang1,2†, Dingsong Wu1,2, Jianwei Huang1,2, Wenshan Hong1,2, Lu Cao1,2, Chang Liu1,2, Cong Li1,2, Yu Xu1,2, Qiang Gao1,2, Taimin Miao1,2, Guodong Liu1,2,3, Shiliang Li1,2,3, Li Huang1, Huiqian Luo1,2,3, Zuyan Xu4, Hongjun Gao1,2,3,5, Lin Zhao1,2,3*, and X. J. Zhou1,2,3,6*
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 2University of Chinese Academy of Sciences, Beijing 100049, China 3Songshan Lake Materials Laboratory, Dongguan 523808, China 4Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China 5CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China 6Beijing Academy of Quantum Information Sciences, Beijing 100193, China
Abstract：High resolution angle-resolved photoemission spectroscopy (ARPES) measurements are carried out on CaKFe$_4$As$_4$, KCa$_2$Fe$_4$As$_4$F$_2$ and (Ba$_{0.6}$K$_{0.4}$)Fe$_2$As$_2$ superconductors. Clear evidence of band folding between the Brillouin zone center and corners with a ($\pi$,$\pi$) wave vector has been found from the measured Fermi surface and band structures in all the three kinds of superconductors. A dominant $\sqrt{2} \times \sqrt{2}$ surface reconstruction is observed on the cleaved surface of CaKFe$_4$As$_4$ by scanning tunneling microscopy (STM) measurements. We propose that the commonly observed $\sqrt{2} \times \sqrt{2}$ reconstruction in the FeAs-based superconductors provides a general scenario to understand the origin of the ($\pi$,$\pi$) band folding. Our observations provide new insights in understanding the electronic structure and superconductivity mechanism in iron-based superconductors.
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2021, Vol. 38 
