Testing the dx2−y2*-wave pairing symmetry by quasiparticle interference and Knight shift in BiS2-based superconductors

Yi Gao; Tao Zhou; Huaixiang Huang; Peiqing Tong; Qiang-Hua Wang

doi:10.1103/PhysRevB.90.054518

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Testing the dx2−y2*-wave pairing symmetry by quasiparticle interference and Knight shift in BiS2-based superconductors

Yi Gao, Tao Zhou, Huaixiang Huang, Peiqing Tong, Qiang-Hua Wang

DOI 10.1103/PhysRevB.90.054518 · Physical Review B

T1

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Abstract

The quasiparticle interference (QPI) patterns in BiS2-based superconductors are theoretically investigated by taking into account the spin-orbital coupling and assuming the recently proposed dx2−y2*-wave pairing symmetry. We found two distinct scattering wave vectors whose evolution can be explained based on the evolution of the constant-energy contours. In addition, we also studied the QPI spectra in the conventional s-wave, d-wave, and extended s-wave cases and propose to further measure the Knight shift to distinguish the dx2−y2*-wave pairing from the d-wave one. The QPI spectra as well as the Knight shift presented in this paper can thus be compared with future scanning tunneling microscopy and NMR experiments to test whether the pairing symmetry is dx2−y2* wave in BiS2-based superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi4O4S3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.5	Pressure not reported	unknown
LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.6	Pressure not reported	unknown