Plaquette ground state in the two-dimensional SU(4) spin-orbital model

Authors
van den Bossche, M Zhang, FC Mila, F
Citation
M. Van Den Bossche et al., Plaquette ground state in the two-dimensional SU(4) spin-orbital model, EUR PHY J B, 17(3), 2000, pp. 367-370
Citations number
18
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
EUROPEAN PHYSICAL JOURNAL B
ISSN journal
14346028 → ACNP
Volume
17
Issue
3
Year of publication
2000
Pages
367 - 370
Database
ISI
SICI code
1434-6028(200010)17:3<367:PGSITT>2.0.ZU;2-N
Abstract
In order to understand the properties of Mott insulators with strong ground state orbital fluctuations, we study the zero temperature properties of th e SU(4) spin-orbital model on a square lattice. Exact diagonalizations of f inite clusters suggest that the ground state is disordered with a singlet-m ultiplet gap and possibly low-lying SU(4) singlets in the gap. An interpret ation in terms of plaquette SU(4) singlets is proposed. The implications fo r LiNiO2 are discussed.