Origin of the tiny energy gap and Dirac points in monoclinic trilayer nickelate La${}_4$Ni${}_3$O${}_{10}$

Hu Zhang

Superconductivity was recently found in trilayer nickelate La${}_4$Ni${}_3$O${}_{10}$ under high pressure with a phase transition from the monoclinic P2${}_1$/a structure to the tetragonal…