Supersymmetric Mean-Field Theory of t-J Model
Chi-Ho Cheng, T. K. Ng
Abstract
The supersymmetric formulation of t-J model is studied in this paper at the mean-field level where δ-T phase diagram is computed. We find that slave-fermion-like spiral phase is stable at low doping concentration, and the slave-boson-like d-wave fermionic spin pairing state becomes energetically favourable when δ≥ 0.23. An improvement in free energy using Gutzwiller's method lowers the transition doping concentration to 0.06. We also point out the existence of new branches of excitations in the supersymmetric theory.
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