3 papers
cond-mat1995
Physical Meaning of the Affleck-Kennedy-Lieb-Tasaki S=1 Quantum spin chain
U. Schollwoeck, Th. Jolicoeur, T. Garel
Most of the present understanding of the S=1 quantum spin chains displaying the Haldane gap is coming from the so-called valence-bond-solid Hamiltonian which has an exactly known g…
cond-mat1992
Dynamical Properties of a Haldane Gap Antiferromagnet
O. Golinelli, Th. Jolicoeur, R. Lacaze
We study the dynamic spin correlation function of a spin one antiferromagnetic chain with easy-plane single-ion anisotropy. We use exact diagonalization by the Lancz\H os method fo…
cond-mat1992
Generalized spin density wave state of the Hubbard model on the C12 and C60 clusters
L. Bergomi, J. P. Blaizot, Th. Jolicoeur +1
The one-band Hubbard model at half-filling on a truncated tetrahedron (C), and on the C molecule is studied. Within the Hartree-Fock approximation, we find a magnetic…