Single-Band versus Two-Band Description of Magnetism in Infinite-Layer Nickelates

We present a weak-coupling analysis of magnetism in infinite-layer nickelates, where we compare a single-band description with a two-band model. Both models predict that (i) hybridization due to hopping is negligible, and (ii) the magnetic properties are characterized by very similar dynamic structure factors, S((sic),omega), at the points (pi,pi,0) and (pi,pi,pi). This gives effectively a two-dimensional description of the magnetic properties.