1 1 A ug 1 99 9 Supersymmetric Mean - Field Theory of t - J Model
نویسندگان
چکیده
The supersymmetric formulation of t-J model is studied in this paper at the mean-field level where the 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 δ ∼ 0.06. We also point out the existence of new branches of excitations in the supersymmetric theory.
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