Density correlations in the half-filled Hubbard model

We consider density-density correlations in the one-dimensional Hubbard mod el at half filling. On intuitive grounds one might expect them to exhibit a n exponential decay. However, as has been noted recently, this is not obvio us from the Bethe Ansatz/conformal field theory (BA/CFT) approach, We show that by supplementing the BA/CFT analysis with simple symmetry arguments on e can easily prove that correlations of the lattice density operators decay exponentially. [S0163-1829(99)12135-0].