Probing active/passive bands by quasiparticle interference in Sr${}_2$RuO${}_4$

Abstract

The quasiparticle interference (QPI) in Sr${}_2$RuO${}_4$ 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 Sr${}_2$RuO${}_4$ is a topological superconductor.

6 pages, 4 figures. Due to the size limits, the original high-resolution figures can be asked for by emailling [email protected]

References in corpus (4)

• Non-Abelian Anyons and Topological Quantum Computation
• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Chiral P-Wave Order in Sr_2RuO_4
• Hidden quasi one-dimensional superconductivity in Sr${}_2$RuO${}_4$

Cited by in corpus (3)

• Momentum Resolved Superconducting Energy Gaps of Sr${}_2$RuO${}_4$ from Quasiparticle Interference Imaging
• Multiorbital and hybridization effects in the quasiparticle interference of triplet superconductor Sr2RuO4
• Probing Sign-Changing Order Parameters via Impurity States in unconventional superconductors: Implications for La${}_3$Ni${}_2$O${}_7$ Superconductors with interlayer pairing