Weak-antilocalization and superconductivity at the (111) KTaO3 Interfaces

The intersection of two-dimensional superconductivity and topologically nontrivial states hosts a wide range of quantum phenomena, including Majorana fermions. Here, we report on the observation of two-dimensional superconductivity and weak anti-localization at the TiO_x/KTaO₃(111) interfaces. A remnant, saturating resistance persists below the transition temperature as superconducting puddles fail to reach phase coherence. Signatures of weak anti-localization are observed below the superconducting transition, suggesting the coexistence of superconductivity and weak anti-localization. The superconducting interfaces show roughly one order of magnitude larger weak anti-localization correction, compared to non-superconducting interfaces, alluding to the presence of topologically nontrivial states in these interfaces.