Electronic Structure and Noncentrosymmetric Superconductivitity in Three-Orbital t2g Model with Spin–Orbit Coupling: Sr2RuO4 near [001] Surface/Interface

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We study Rashba spin–orbit coupling and noncentrosymmetric spin-triplet superconductivity near the [001] surface/interface of Sr2RuO4 on the basis of the three-orbital tight-binding model. We show the unconventional spin texture arising from the orbital degeneracy in the t2g-orbitals. The spin-triplet helical-R state with d-vector \({d}= p_{y} \hat{x} + p_{x} \hat{y}\) is stabilized in such an unconventional electronic structure, in contrast to the helical-L state \({d}= p_{y} \hat{x} - p_{x} \hat{y}\) in a conventional Rashba superconductor. The textured superconductivity near the [001] surface of Sr2RuO4 as well as at the interface of Sr2RuO4/Sr3Ru2O7 is discussed.