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Spontaneous plaquette formation in the SU(4) spin-orbital ladder
M van den Bossche1, P Azaria, P Lecheminant
1Laboratoire de Physique Quantique, Université Paul Sabatier, 31062 Toulouse Cedex 04, France.
Physical Review Letters
|May 1, 2001
Abstract:
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. As in the case of SU(2) models, there is a singlet-multiplet gap in the spectrum, but the ground state is twofold degenerate. An interpretation in terms of SU(4)-singlet plaquettes is proposed. The implications for general two-dimensional lattices are outlined.