Spin liquid ground state in a two dimensional non-frustrated spin model

Details Spin liquid ground state in a two dimensional non-frustrated spin model Spin liquid ground state in a two dimensional non-frustrated spin model

1999-02-09

arxiv.org/abs/cond-mat/9902116v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, Revtex

Scientific paper

10.1103/PhysRevLett.83.3065

We consider an exchange model describing two isotropic spin-1/2 Heisenberg antiferromagnets coupled by a quartic term on the square lattice. The model is relevant for systems with orbital degeneracy and strong electron-vibron coupling in the large Hubbard repulsion limit, and is known to show a spin-Peierls-like dimerization in one dimension. In two dimensions we calculate energy gaps, susceptibilities, and correlation functions with a Green's Function Monte Carlo. We find a finite spin gap and no evidence of any kind of order. We conclude that the ground state is, most likely, a spin liquid of resonating valence bonds.

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