Recently, a research team led by Professor SI Liang from the School of Physics at Northwest University, in collaboration with other researchers, has achieved important results in the field of strongly correlated nickel-based superconducting oxides. Combining advanced theoretical methods such as Density Functional Theory, Wannier Function projection, Tight Binding Approximation, Dynamic Average Field Approximation, and Dynamic Vertex Approximation, the team theoretically predicted a method to transform the non-superconducting monolayer strongly correlated nickel-based oxide La₂NiO₄ into a superconductor. This transformation is achieved through electron doping by introducing hydrogen ions. The hydrogenated La₂NiO₄ exhibits an electronic structure and superconducting properties similar to those of copper-based superconductors. The related paper, titled “Topotactical Hydrogen Induced Single-Band d-Wave Superconductivity in La₂NiO₄,” was published in Physical Review Letters. This research not only deepens the understanding of the origin of superconductivity in nickel-based superconductors but also provides a theoretical prediction for realizing new types of nickel-based superconducting oxides.
NWU’s School of Physics is the primary affiliation for this research. GAO Ying, a Master’s student enrolled in 2023 supervised by Professor SI Liang, is the first author. Jointly-trained doctoral student WU Wenfeng is a co-first author. SI Liang is the first corresponding author, and Professor Karsten Held from the Vienna University of Technology is a co-corresponding author.
