Supersymmetric Mean-Field Theory of t-J Model

Details Supersymmetric Mean-Field Theory of t-J Model Supersymmetric Mean-Field Theory of t-J Model

1999-08-11

arxiv.org/abs/cond-mat/9908161v1

Europhysics Letters 52, 87 (2000)

Physics

Condensed Matter

Superconductivity

11 pages and 2 figures

Scientific paper

10.1209/epl/i2000-00408-4

The supersymmetric formulation of t-J model is studied in this paper at the mean-field level where $\delta$-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 $\delta\geq$ 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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