Probing active/passive bands by quasiparticle interference in Sr2RuO4

Article

关键词: TIME-REVERSAL SYMMETRY;    SUPERCONDUCTOR SR2RUO4;    LAYERED PEROVSKITE;    BREAKING;    STATES;    SCATTERING;    PARITY;    GAP;   

DOI  :  10.1103/PhysRevB.88.094514

来源: SCIE

【 摘 要 】

The quasiparticle interference (QPI) in Sr2RuO4 is theoretically studied based on two different pairing models in order to propose an experimental method to test them. For a recently proposed two-dimensional model with pairing primarily from the gamma band, we found clear QPI peaks evolving with energy, and their locations can be determined from the tips of the constant-energy contour (CEC). On the other hand, for a former quasi-one-dimensional model with pairing on the alpha and beta bands, the QPI spectra are almost dispersionless and may involve off-shell contributions to the scatterings beyond the CEC. The different behaviors of the QPI in these two models may help to resolve the controversy of active/passive bands and whether Sr2RuO4 is a topological superconductor.

【 授权许可】

Free