Spontaneous plaquette formation in the SU(4) spin-orbital ladder

Authors
van den Bossche, M Azaria, P Lecheminant, P Mila, F
Citation
M. Van Den Bossche et al., Spontaneous plaquette formation in the SU(4) spin-orbital ladder, PHYS REV L, 86(18), 2001, pp. 4124-4127
Citations number
20
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
86
Issue
18
Year of publication
2001
Pages
4124 - 4127
Database
ISI
SICI code
0031-9007(20010430)86:18<4124:SPFITS>2.0.ZU;2-A
Abstract
The low-energy properties of the SU(4) spin-orbital model on a two-leg ladd er are studied by a variety of analytical and numerical techniques. As in t he 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 S U(4)-singlet plaquettes is proposed. The implications for general two-dimen sional lattices are outlined.