Néel and Spin-Peierls ground states of two-dimensional SU(N) quantum antiferromagnets
Harada, Kenji · Kawashima, Naoki · Troyer, Matthias
Original · EN
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≤ 4 is found to be of the Néel type with broken SU(N) symmetry, whereas it is of the Spin-Peierls type for N≥ 5 with broken lattice translational invariance. No intermediate spin-liquid phase was observed in contrast to previous numerical simulations on smaller lattices [Santoro et al., Phys. Rev. Lett. 83 3065 (1999)].
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