Spin Hartree-Fock approach to quantum Heisenberg antiferromagnets in low dimensions

A. Werth, P. Kopietz, O. Tsyplyatyev

We construct a new mean-field theory for quantum (spin-1/2) Heisenberg antiferromagnet in one (1D) and two (2D) dimensions using a Hartree-Fock decoupling of the four-point correla…