Magnetic spin topological textures recently found their electrical counterparts in polar topologies emerging from the condensation of inhomogeneous polar atomic distortions. Here, we further extend the concept to other non-polar atomic degrees of freedom. Taking SrTiO3 as a prototypical example, we investigate from second-principles atomistic simulations, the equilibrium domain structures and topological textures associated with the natural antiferrodistortive rotations of its oxygen octahedra. % Besides the common 90∘ antiferrodistortive domain walls (twin boundaries), we identify new metastable 180∘ domain walls oriented along the {100}pc direction, when compressive epitaxial strain is applied. These domains exhibit complex antiferrodistortive Bloch- and N\'eel-like configurations with the later being the most favorable. We also stabilize antiferrodistortive vortex and antivortex structures which are accompanied by co-localized polarization vortices and a complex pattern of the local strain field, giving rise to a trimodal topological structures. Our results extends the concept of topological ordering to non-polar structural degrees of freedom and highlights the role of lattice-mediated couplings in stabilizing complex textures in perovskite oxides.
@article{arxiv.2510.08186,
title = {Multimodal Topological Textures Arising from Coupled Structural Orders in SrTiO$_3$},
author = {Fernando Gómez-Ortiz and Louis Bastogne and Philippe Ghosez},
journal= {arXiv preprint arXiv:2510.08186},
year = {2025}
}