Topological and edge state properties of a three-band model for Sr2RuO4

Abstract

Modeling the spin-triplet superconductor Sr2RuO4 through a three-orbital tight-binding model we investigate topological properties and edge states assuming chiral p-wave pairing. In concordance with experiments the three Fermi surfaces consist of two electron-like and one hole-like one corresponding to the alpha-, beta- and gamma-band on the level of a two-dimensional system. The quasi-particle spectra and other physical quantities of the superconducting phase are calculated by means of a self-consistent Bogoliubov-de Gennes approach for a ribbon shaped system. While a full quasiparticle excitation gap is realized in the bulk system, at the edges gapless states appear some of which have linear and others nearly flat dispersion around zero energy. This study shows the interplay between spin-orbit coupling induced spin currents, chiral edge currents and correlation driven surface magnetism. The topological nature of the chiral p-wave state manifests itself in the gamma-band characterized by an integer Chern number. As the gamma-band is close to a Lifshitz transition in Sr2RuO4, changing the sign of the Chern number, the topological nature may be rather fragile.

10 pages, 16 figures

References in corpus (6)

• Chiral P-Wave Order in Sr_2RuO_4
• Limits on Superconductivity-Related Magnetization in Sr${}_2$RuO${}_4$ and PrOs${}_4$Sb${}_{12}$ from Scanning SQUID Microscopy
• Edge states of Sr${}_2$RuO${}_4$ detected by in-plane tunneling spectroscopy
• Frequency and temperature dependence of the anomalous Hall conductivity in a chiral px+ipy superconductor with impurities
• Properties of edge states in spin-triplet two-band superconductor
• Edge-currents in superconductors with a broken time-reversal symmetry

Cited by in corpus (22)

• Large Chern Number and Edge Currents in Sr2RuO4
• Non-topological nature of the edge current in a chiral p-wave superconductor
• Possible three-dimensional nematic odd-parity superconductivity in Sr${}_2$RuO${}_4$
• Microscopic theory of tunneling spectroscopy in Sr${}_2$RuO${}_4$
• Shiba chains of scalar impurities on unconventional superconductors
• Leggett modes and multi-band superconductivity in Sr2RuO4
• Josephson effect in a multi-orbital model for Sr${}_2$RuO${}_4$
• Thermal Hall conductivity and topological transition in a chiral p-wave superconductor for Sr2RuO4
• Surface magnetism in a chiral d-wave superconductor with hexagonal symmetry
• Orbital Symmetry and Orbital Excitations in High-$T_c$ Superconductors
• Possibility of mixed helical p-wave pairings in Sr${}_2$RuO${}_4$
• Enhancing triplet superconductivity by the proximity to a singlet superconductor in oxide heterostructures
• Thermal Hall Conductivity in Superconducting Phase on Kagome Lattice
• Effect of the RuO6 octahedron rotation at the Sr2RuO4 surface on topological property
• Interband interference effects at the edge of a multiband chiral p-wave superconductor
• Evolution of the filamentary 3-Kelvin phase in Pb-Ru-Sr2RuO4 Josephson junctions
• Robust semi-Dirac points and unconventional topological phase transitions in doped superconducting Sr2IrO4 tunnel coupled to t2g electron systems
• Laser pulse probe of chirality of Cooper pairs
• Spontaneous surface current in multi-component cubic superconductors with time-reversal symmetry breaking
• Thermal Hall conductivity in the spin-triplet superconductor with broken time-reversal symmetry
• DC-current induced domain wall in a chiral $p$-wave superconductor
• Examining the possibility of chiral superconductivity in Sr${}_2$RuO${}_4$ and other compounds via applied supercurrent