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By using a combination of heteroepitaxial growth, structure refinement basedon synchrotron x-ray diffraction and first-principles calculations, we showthat the symmetry-protected Dirac line nodes in the topological semimetallicperovskite SrIrO3 can be lifted simply by applying epitaxial constraints. Inparticular, the Dirac gap opens without breaking the Pbnm mirror symmetry. Invirtue of a symmetry-breaking analysis, we demonstrate that the originalsymmetry protection is related to the n-glide operation, which can beselectively broken by different heteroepitaxial structures. This symmetryprotection renders the nodal line a nonsymmorphic Dirac semimetallic state. Theresults highlight the vital role of crystal symmetry in spin-orbit-coupledcorrelated oxides and provide a foundation for experimental realization oftopological insulators in iridate-based heterostructures.

Strain-induced nonsymmorphic symmetry breaking and removal of Dirac semimetallic nodal line in an orthoperovskite iridate