Supersymmetry in models with strong on-site Coulomb repulsion - application to t-J model

Details Supersymmetry in models with strong on-site Coulomb repulsion - application to t-J model Supersymmetry in models with strong on-site Coulomb repulsion - application to t-J model

1998-02-07

arxiv.org/abs/cond-mat/9802080v1

Physical Review B 59, R6616 (1999)

Physics

Condensed Matter

12 pages, Latex file, 1 figure

Scientific paper

10.1103/PhysRevB.59.R6616

A supersymmetric way of imposing the constraint of no double occupancy in models with strong on-site Coulomb repulsion is presented in this paper. In this formulation the physical operators in the constrainted Hilbert space are invariant under local unitary transformations mixing boson and fermion representations. As an illustration the formulation is applied to the $t-J$ model. The model is studied in the mean-field level in the J=0 limit where we show how both the slave-boson and slave-fermion formulations are included naturally in the present approach and how further results beyond both approaches are obtained.

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