166 research outputs found
-wave Pairing in BiS Superconductors
Recent angle resolved photoemission spectroscopy(ARPES) experiments have
suggested that BiS based superconductors are at very low electron doping.
Using random phase approximation(RPA) and functional renormalization group(FRG)
methods, we find that -wave pairing symmetry belonging to A
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 , and Hubbard-like Coulomb interactions 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.Comment: published version, EPL(editor's choice
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