2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27841We propose a theory for doped antiferromagnet based on a bosonic resonating-valence-bond (RVB) state with incorporating the phase string effect. Both antiferromagnetic (AF) and superconducting phase transitions occur naturally within such a bosonic RVB phase. Two distinct metallic regions -- underdoping and optimum-doping -- are also found to be a logic consequence, whose unique features explain the recent neutron-scattering measurements in cuprates.4 pages, Revtex, 2 Postscript figuresStrongly Correlated ElectronsSuperconductivitytext