Constraints on the two-dimensional pseudo-spin 1/2 Mott insulator description of Sr${}_2$IrO${}_4$

Berend Zwartsenberg, Ryan P. Day, Elia Razzoli +10

Sr${}_2$IrO${}_4$ has often been described via a simple, one-band pseudo-spin 1/2 model, subject to electron-electron interactions, on a square lattice, fostering analogies with cu…