2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/108403We study the effect of site occupation in 2d quantum spin systems at finite temperature in a $π$-flux state description at the mean-field level. We impose each lattice site to be occupied by a single SU(2) spin. This is realized by means of a specific prescription. We consider the low-energy Hamiltonian which is mapped into a $QED_3$ Lagrangian of spinons. We compare the dynamically generated mass to the one obtained by means of an average site occupation constraint.9 pages and 4 figuresStrongly Correlated Electronstext