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Semi-Dirac fermions are known to exist at the critical points of topologicalphase transitions requiring fine-tuning of the parameters. We show that robustsemi-Dirac points can appear in a heterostructure consisting of superconductingSr2IrO4 and a t2g electron system (t2g-ES) without fine-tuning. They aretopologically stable in the presence of the symmetries of the model, metallict2g-ES and a single active band in Sr2IrO4. If the t2g metal is coupled to twodifferent layers of Sr2IrO4 (effectively a multiband superconductor) in athree-layer-structure the semi-Dirac points can split into two stable Diracpoints with opposite chiralities. A similar transition can be achieved if thet2g-ES supports intrinsic triplet superconductivity. By considering Sr2RuO4 asan example of a t2g-ES we predict a rich topological phase diagram as afunction of various parameters.

Robust semi-Dirac points and unconventional topological phase transitions in doped superconducting Sr2IrO4 tunnel coupled to t2g electron systems