2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/23885We derive an effective spin Hamiltonian for the one-dimensional half-filled Alternating Hubbard model in the limit of strong on-site repulsion. We show that the effective Hamiltonian is a spin $S=1/2$ Heisenberg chain with asymmetric next-nearest-neighbor (nnn) exchange.8 pages, RevTeX4Strongly Correlated Electronstext