High-Temperature Superconductivity in La 3 Ni 2 O 7

Motivated by the recent discovery of high-temperature superconductivity in bilayer La 3 Ni 2 O 7 under pressure, we study its electronic properties and superconductivity due to strong electron correlation. Using the inversion symmetry, we decouple the low-energy electronic structure into block-diagonal symmetric and antisymmetric sectors. It is found that the antisymmetric sector can be reduced to a one-band system near half filling, while the symmetric bands occupied by about two electrons are heavily overdoped individually. Using the strong coupling mean field theory, we obtain strong superconducting pairing with B 1g symmetry in the antisymmetric sector. We propose that due to the spin-orbital exchange…

• UD
  U.S. Department of Energy

  Awards: DE-FG02-99ER45747, FG02-99ER45747, DE-FG02-, DE-FG02
• NN
  National Natural Science Foundation of China

  Awards: XDB33000000, 11920101005, XDB28000000, 12174428, 11888101
• CA
  Chinese Academy of Sciences

  Awards: 11888101, XDB33000000, 2022YSBR-048, XDB28000000
• BE
  Basic Energy Sciences

  Awards: DE-FG02-99ER45747, DE-FG02