Dimer phases in quantum antiferromagnets with orbital degeneracy

Details Dimer phases in quantum antiferromagnets with orbital degeneracy Dimer phases in quantum antiferromagnets with orbital degeneracy

2007-05-21

arxiv.org/abs/0705.2990v2

Phys. Rev. B 76, 132407 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

Final version, minor changes

Scientific paper

10.1103/PhysRevB.76.132407

We study and solve the ground-state problem of a microscopic model for a family of orbitally degenerate quantum magnets. The orbital degrees of freedom are assumed to have directional character and are represented by static Potts-like variables. In the limit of vanishing Hund's coupling, the ground-state manifold of such a model is spanned by the hard-core dimer (spin singlet) coverings of the lattice. The extensive degeneracy of dimer coverings is lifted at a finite Hund's coupling through an order-out-of-disorder mechanism by virtual triplet excitations. The relevance of our results to several experimentally studied systems is discussed.

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