SU(N) Heisenberg model with multi-column representations

Abstract

The $\mathrm{SU}(N)$ symmetric antiferromagnetic Heisenberg model with multi-column representations on the two-dimensional square lattice is investigated by quantum Monte Carlo simulations. For the representation of Young diagram with two columns, we confirm that a valence-bond solid order appears as soon as the Néel order disappears at $N=10$ indicating no intermediate phase. In the case of the representation with three columns, there is no evidence for both of the Néel and the valence-bond solid ordering for $N\ge 15$. This is actually consistent with the large-$N$ theory, which predicts that the VBS state immediately follows the Néel state, because the expected spontaneous order is too weak to be detected.

5 pages, 5 figures