| Issue |
EPL
Volume 108, Number 2, October 2014
|
|
|---|---|---|
| Article Number | 27006 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/108/27006 | |
| Published online | 21 October 2014 | |
g-wave pairing in BiS2 superconductors
1 Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China
2 Department of Physics, Purdue University - West Lafayette, Indiana 47907, USA
(a) jphu@iphy.ac.cn
Received: 2 October 2014
Accepted: 6 October 2014
Recent angle-resolved photoemission spectroscopy (ARPES) experiments have suggested that BiS2-based superconductors are at very low electron doping. Using random phase approximation (RPA) and functional renormalization group (FRG) methods, we find that g-wave pairing symmetry belonging to the 
irreducible representation is dominant at electron doping 
. The pairing symmetry is determined by inter-pocket nesting and orbital characters on the Fermi surfaces and is robust in a two-orbital model including both Hund's coupling J, and Hubbard-like Coulomb interactions U and 
with relatively small 
. With the increasing electron doping, the g-wave state competes with both the s-wave 
and d-wave 
states and no pairing symmetry emerges dominantly.
PACS: 74.20.Mn – Nonconventional mechanisms / 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.)
© EPLA, 2014
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