Extended Mean-Field Theory for the 2D Hubbard Model in Degenerate Dilute Electron Gases: Fluctuations, Superconducting Dome, and Interaction Mechanisms in Strontium Titanate

Xing Yang, Xinyu Zhang, Xuchang Zhang

Strontium titanate ($\mathrm{SrTi}{\mathrm{O}}_3,\mathrm{STO}$) dome-shaped superconducting transition temperature as a function of chemical potential, consistent with STO experiments, and shows that…