|
|||||
|
|
Plaquette ground state in the two-dimensional SU(4) spin-orbital model |
|
| Authors: | M van den Bossche F-C Zhang F Mila |
| Institution: | (1) Laboratoire de Physique Quantique, Université Paul Sabatier, 31062 Toulouse Cedex, France, FR;(2) Department of Physics, University of Cincinnati, Cincinnati, OH 45221-0011, USA, US;(3) Institut de Physique Théorique, Université de Lausanne, 1015 Lausanne, Switzerland, CH |
| Abstract: | In order to understand the properties of Mott insulators with strong ground state orbital fluctuations, we study the zero temperature properties of the SU(4) spin-orbital model on a square lattice. Exact diagonalizations of finite clusters suggest that the ground state is disordered with a singlet-multiplet gap and possibly low-lying SU(4) singlets in the gap. An interpretation in terms of plaquette SU(4) singlets is proposed. The implications for LiNiO2 are discussed. Received 6 July 2000 |
| Keywords: | PACS 75 10 Jm Quantized spin models - 11 30 -j Symmetry and conservation laws - 75 40 Mg Numerical simulation studies |
| 本文献已被 SpringerLink 等数据库收录！ | |