Theory Of The One Dimensional SU(4) Spin-Orbital Model

Details Theory Of The One Dimensional SU(4) Spin-Orbital Model Theory Of The One Dimensional SU(4) Spin-Orbital Model

1999-03-02

arxiv.org/abs/cond-mat/9903047v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure

Scientific paper

The one-dimensional spin-orbital model is studied by means of Abelian bosonization. We derive the low-energy effective theory which enables us to study small deviations from the SU(4) symmetric point. We show that there exists a massless region with algebraically decaying correlation functions, $\sim \cos(\pi/{2a_0} x) x^{-3/2}$. When entering the massive phase, the system displays an approximate SO(6) enlarged symmetry with a dimerization type of ordering consisting in alternating spin and orbital singlets.

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