title: Néel and Spin-Peierls ground states of two-dimensional SU(N) quantum antiferromagnets.
abstract: The two-dimensional SU(N) quantum antiferromagnet, a generalization of the quantum Heisenberg model, is investigated by quantum Monte Carlo simulations. The ground state for N<or=4 is found to be of the Néel type with broken SU(N) symmetry, whereas it is of the Spin-Peierls type for N>or=5 with broken lattice translational invariance. Our computation of the magnetization and the dimerization order parameter shows the absence of the intermediate spin-liquid phase.
authors.affiliation: Department of Applied Analysis and Complex Dynamical Systems, Kyoto University, Kyoto 606-8501, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Harada
authors.forename: Naoki
authors.initials: N
authors.lastname: Kawashima
authors.forename: Matthias
authors.initials: M
authors.lastname: Troyer