The study of exotic superconductivity in two dimensions has been a central theme in solid state and materials research communities. Experimentally exploring and identifying new fascinating interface superconductors with a high transition temperature (Tc) is challenging. Here, we report an experimental observation of intriguing two-dimensional superconductivity with a Tc up to 3.8 K at the interface between Mott insulator Ti2O3 and polar semiconductor GaN. At the verge of superconductivity, we also observe a striking quantum metallic-like state, demonstrating that it is a precursor to the two-dimensional superconductivity as the temperature is decreased. Our work is the first time finding this intriguing superconducting state at the heterointerface, which not only brings a new broad of perspective on the emergent quantum phenomena at the heterointerfaces but also sheds new light on exploiting the novel heterointerface superconductivity with high-Tc via heterostructure engineering.
@article{arxiv.2106.06948,
title = {Two-Dimensional Superconductivity at the Titanium Sesquioxide Heterointerface},
author = {Lijie Wang and Wenhao He and Guangyi Huang and Huanyi Xue and Guanqun Zhang and Gang Mu and Shiwei Wu and Zhenghua An and Changlin Zheng and Yan Chen and Wei Li},
journal= {arXiv preprint arXiv:2106.06948},
year = {2022}
}