Topological gauge structure and phase diagram for weakly doped antiferromagnets

We show that a topological gauge structure in an effective description of the t-J model gives rise to a global phase diagram of antiferromagnetic and superconducting phases in a weakly doped regime. Dual confinement and deconfinement of holons and spinons play essential roles here, with a quantum critical point at a doping concentration x(c) similar or equal to 0.043. The complex experimental phase diagram at low doping is well described within such a framework.