Charge and spin collective modes in a quasi-1D model of Sr2RuO4

Abstract

Given that Sr2RuO4 is a two-component p-wave superconductor, there exists the possibility of well defined collective modes corresponding to fluctuations of the relative phase and spin-orientation of the two components of the order parameter. We demonstrate that at temperatures much below Tc, these modes have energies small compared to the pairing gap scale if the superconductivity arises primarily from the quasi 1D (dxz and dyz) bands, while it is known that their energies become comparable to the pairing gap scale if there is a substantial involvement of the quasi 2D (dxy) band. Therefore, the orbital origin of the superconductivity can be determined by measuring the energies of these collective modes.

arXiv comment11 pages (6 pages for main text), 2 figures

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• Theory of superconductivity in a three-orbital model of Sr${}_2$RuO${}_4$
• Large Chern Number and Edge Currents in Sr2RuO4
• Superconducting Symmetries of Sr${}_2$RuO${}_4$ from First-Principles Electronic Structure
• Charge-$4e$ superconductivity from nematic superconductors in 2D and 3D
• Anisotropy of the Superconducting State in Sr2RuO4
• Spectroscopic signatures of time-reversal symmetry breaking superconductivity
• Possible three-dimensional nematic odd-parity superconductivity in Sr${}_2$RuO${}_4$
• Exotic Cooper pairing in multi-orbital models of Sr${}_2$RuO${}_4$
• Theory of the Evolution of Superconductivity in Sr${}_2$RuO${}_4$ under Anisotropic Strain
• Fluctuation and strain effects in a chiral $p$-wave superconductor
• Leggett modes and multi-band superconductivity in Sr2RuO4
• Superconductivity in Sr${}_2$RuO${}_4$ thin film under biaxial strain
• Quasiparticle self-consistent GW calculation of Sr${}_2$RuO${}_4$ and SrRuO${}_3$:
• Vortex Structures in Model p-Wave Superconducting Sr2RuO4 -- Single 2-Dimensional Band v.s. Quasi-1-Dimensional Band
• Cooper-Pair Spin Current in a Strontium Ruthenate Heterostructure
• Anomalous Hall conductivity of clean Sr2RuO4 at finite temperatures
• Anisotropy and Strong-Coupling Effects on the Collective Mode Spectrum of Chiral Superconductors: Application to Sr${}_2$RuO${}_4$
• A note on the upper critical field of Sr${}_2$RuO${}_4$ under strain
• Strong Increase in Ultrasound Attenuation Below T${}_{\mathrm{c}}$ in Sr${}_2$RuO${}_4$: Possible Evidence for Domains
• Inter-orbital p- and d-wave pairings between $d_{xz/yz}$ and $d_{xy}$ orbitals in Sr${}_2$RuO${}_4$
• Surface Cooper pair spin waves in triplet superconductors
• Floquet engineering triplet superconductivity in superconductors with spin-orbit coupling or altermagnetism
• Anomalous Hall effect in semiconductor quantum wells in proximity to chiral p-wave superconductors
• Topological superconductivity from transverse optical phonons in oxide heterostructures
• Even odder after twenty-three years: the superconducting order parameter puzzle of Sr2RuO4
• Study of unconventional superfluid phases and the phase dynamics in spin-orbit coupled bose system