SU(4) Spin-Orbital Two-Leg Ladder, Square and Triangle Lattices

Details SU(4) Spin-Orbital Two-Leg Ladder, Square and Triangle Lattices SU(4) Spin-Orbital Two-Leg Ladder, Square and Triangle Lattices

2002-11-05

arxiv.org/abs/cond-mat/0211074v1

Phys. Rev. B 66, 214516 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages

Scientific paper

10.1103/PhysRevB.66.214516

Based on the generalized valence bond picture, a Schwinger boson mean field theory is applied to the symmetric SU(4) spin-orbital systems. For a two-leg SU(4) ladder, the ground state is a spin-orbital liquid with a finite energy gap, in good agreement with recent numerical calculations. In two-dimensional square and triangle lattices, the SU(4) Schwinger bosons condense at (\pi/2,\pi/2) and (\pi/3,\pi/3), respectively. Spin, orbital, and coupled spin-orbital static susceptibilities become singular at the wave vectors, twice of which the bose condensation arises at. It is also demonstrated that there are spin, orbital, and coupled spin-orbital long-range orderings in the ground state.

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