Surface State of Inter-orbital Pairing State in Sr2RuO4 Superconductor
Abstract
We study the (001) surface state of a recently proposed Eg symmetry inter-orbital-odd spin-triplet s-wave superconducting (SC) state in Sr2RuO4 (SRO). We confirm that this pair potential is transformed into a chiral d-wave pair potential and a pseudo-Zeeman field in the band basis for a low-energy range. Due to the chiral d-wave pair potential, the surface states appear near zero energy in the momentum range enclosed by the nodal lines of the chiral d-wave pair potential for each band at the (001) surface. Nevertheless, the pseudo-Zeeman field gives band splitting of the surface states, and its splitting energy is much smaller than the SC energy gap. The local density of states (LDOS) at the (001) surface of the SC state has a pronounced peak structure at zero energy due to the surface states near zero energy when the order of the resolution is lower than the splitting energy. This peak structure is robust under perturbations, such as an orbital Rashba coupling or an Eu SC pair potential at the surface.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.