The intersection of two-dimensional superconductivity and topologically nontrivial states hosts a wide range of quantum phenomena, including Majorana fermions. Coexistence of topologically nontrivial states and superconductivity in a single material, however, remains elusive. Here, we report on the observation of two-dimensional superconductivity and weak anti-localization at the TiOx/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 a relatively large coherence length in these interfaces.
@article{arxiv.2109.09786,
title = {Coexistence of superconductivity and weak anti-localization at KTaO3 (111) interfaces},
author = {Athby H. Al-Tawhid and Jesse Kanter and Mehdi Hatefipour and Divine P. Kumah and Javad Shabani and Kaveh Ahadi},
journal= {arXiv preprint arXiv:2109.09786},
year = {2022}
}