Topological Gauge Structure and Phase Diagram for Weakly Doped Antiferromagnets

Details Topological Gauge Structure and Phase Diagram for Weakly Doped Antiferromagnets Topological Gauge Structure and Phase Diagram for Weakly Doped Antiferromagnets

2002-06-28

arxiv.org/abs/cond-mat/0206560v2

Phys.Rev.Lett. 90 (2003) 157003

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures, modified version, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.90.157003

We show that the topological gauge structure in the phase string theory of the {\rm t-J} model gives rise to a global phase diagram of antiferromagnetic (AF) and superconducting (SC) 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 $x_c\simeq 0.043$. The complex experimental phase diagram at low doping is well described within such a framework.

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