Pairing symmetry in layered BiS<sub>2</sub> compounds driven by electron–electron correlation

doi:10.1007/s11467-013-0407-8

Front. Phys.

2014, Vol. 9

Issue (2) : 194-199 https://doi.org/10.1007/s11467-013-0407-8

Pairing symmetry in layered BiS₂ compounds driven by electron–electron correlation

Yi Liang¹, Xianxin Wu¹, Wei-Feng Tsai², Jiangping Hu^1,3(

)

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

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Abstract

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.

Keywords BiS₂-based superconductor pairing symmetry electron–electron correlation

Corresponding Author(s): Hu Jiangping,Email:hu4@physics.purdue.edu

Issue Date: 01 April 2014

Cite this article:

Yi Liang,Xianxin Wu,Wei-Feng Tsai, et al. Pairing symmetry in layered BiS₂ compounds driven by electron–electron correlation[J]. Front. Phys. , 2014, 9(2): 194-199.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-013-0407-8
https://academic.hep.com.cn/fop/EN/Y2014/V9/I2/194

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