Fermi surface topology and impurity-induced resonance state in BiS${}_2$-based superconductors

Abstract

Within the two-orbital model for BiS${}_2$-based superconductors, the effect from a single nonmagnetic impurity scattering on the superconducting-state is investigated in terms of the T-matrix approach. By considering three kinds of the typical Fermi surface topology which characterize the essential features of the doping dependence of the electronic structure in BiS${}_2$-based superconductors, it is found that the impurity scattering on the superconducting-state with the conventional $s$-wave, the extended $s$-wave, the $\pm s$-wave, and the $d_{x^2-y^2}$-wave symmetries induces \textit{qualitatively} different resonance states due to the evolution of unique nodal structures on the Fermi surface with doping. These impurity-induced resonance states can be verified directly by the scanning tunneling microscopy experiments, and therefore they are proposed as a probe of the superconducting pairing symmetry in BiS${}_2$-based superconductors.

5 pages, 7 figures

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Cited by in corpus (3)

• Unconventional superconductivity in the BiS${}_2$-based layered superconductor NdO${}_{0.71}$F${}_{0.29}$BiS${}_2$
• Weak phonon-mediated pairing in BiS${}_2$ superconductor from first principles
• Testing the $d_{x^2-y^2}^{\ast }$-wave pairing symmetry by quasiparticle interference in BiS${}_2$-based superconductors