SU(4) Spin-Orbital Two-Leg Ladder, Square and Triangle Lattices
Strongly Correlated Electrons
2009-11-07 v1 Materials Science
Abstract
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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Cite
@article{arxiv.cond-mat/0211074,
title = {SU(4) Spin-Orbital Two-Leg Ladder, Square and Triangle Lattices},
author = {Shun-Qing Shen},
journal= {arXiv preprint arXiv:cond-mat/0211074},
year = {2009}
}
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5 pages