Mechanisms of finite-temperature magnetism in the three-dimensional Hubbard model
Mechanisms of finite-temperature magnetism in the three-dimensional Hubbard model
We examine the nature of the transition to the antiferromagnetically ordered state in the half-filled three-dimensional Hubbard model using the dual-fermion multiscale approach. Consistent with analytics, in the weak-coupling regime we find that spin-flip excitations across the Fermi surface are important and that the strong-coupling regime is described by Heisenberg …