Two-Dimensional Superconductivity at the Titanium Sesquioxide Heterointerface

Abstract

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 ($T_c$) is challenging. Here, we report an experimental observation of intriguing two-dimensional superconductivity with a $T_c$ up to 3.8 K at the interface between Mott insulator Ti${}_2$O${}_3$ 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-$T_c$ via heterostructure engineering.

arXiv comment8 pages, 4 figures

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Cited by in corpus (4)

• Spontaneous rotational symmetry breaking in KTaO${}_3$ heterointerface superconductors
• Evidence for unconventional superconductivity in a spinel oxide
• Coexistence of ferromagnetism and superconductivity at KTaO${}_3$ heterointerfaces
• Unique quantum metallic state in the titanium sesquioxide heterointerface superconductor