Antiferromagnetism in the Exact Ground State of the Half Filled Hubbard Model on the Complete-Bipartite Graph

Gianluca Stefanucci, Michele Cini

As a prototype model of antiferromagnetism, we propose a repulsive Hubbard Hamiltonian defined on a graph $Ł=\mathcal{A}\cup \mathcal{B}$ with $\mathcal{A}\cap \mathcal{B}=\varnothing$ and bonds…