Theory Of The One Dimensional SU(4) Spin-Orbital Model
P. Azaria, A. O. Gogolin, P. Lecheminant, A. A. Nersesyan
Abstract
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, (π/2a0 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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