Spontaneous plaquette formation in the SU(4) Spin-Orbital ladder

Details Spontaneous plaquette formation in the SU(4) Spin-Orbital ladder Spontaneous plaquette formation in the SU(4) Spin-Orbital ladder

2000-06-30

arxiv.org/abs/cond-mat/0006485v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 Postscript figures

Scientific paper

10.1103/PhysRevLett.86.4124

The low-energy properties of the SU(4) spin-orbital model on a two-leg ladder are studied by a variety of analytical and numerical techniques. Like in the case of SU(2) models, there is a singlet-multiplet gap in the spectrum, but the ground-state is two-fold degenerate. An interpretation in terms of SU(4)-singlet plaquettes is proposed. The implications for general two-dimensional lattices are outlined.

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