Pairing symmetry in layered BiS2 compounds driven by electron–electron correlation
Pairing symmetry in layered BiS2 compounds driven by electron–electron correlation
Yi Liang1, Xianxin Wu1, Wei-Feng Tsai2, Jiangping Hu1,3()
1. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2. Department of Physics, Sun Yat-sen University, Kaohsiung 804, Taiwan, China; 3. Department of Physics, Purdue University, West Lafayette, IN 47907, USA
We investigate the pairing symmetry of layered BiS2 compounds by assuming that electron-electron correlation is still important so that the pairing is rather short range. We find that the extended s-wave pairing symmetry always wins over d-wave when the pairing is confined between two short range sites up to next nearest neighbors. The pairing strength is peaked around the doping level x = 0.5, which is consistent with experimental observation. The extended s-wave pairing symmetry is very robust against spin–orbital coupling because it is mainly determined by the structure of Fermi surfaces. Moreover, the extended s-wave pairing can be distinguished from conventional s-wave pairing by measuring and comparing superconducting gaps of different Fermi surfaces.
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