Harada Kenji, Kawashima Naoki, Troyer Matthias
Department of Applied Analysis and Complex Dynamical Systems, Kyoto University, Kyoto 606-8501, Japan.
Phys Rev Lett. 2003 Mar 21;90(11):117203. doi: 10.1103/PhysRevLett.90.117203. Epub 2003 Mar 19.
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.
通过量子蒙特卡罗模拟研究了二维SU(N)量子反铁磁体，它是量子海森堡模型的推广。发现N≤4时的基态是具有SU(N)对称性破缺的奈尔型，而N≥5时是具有晶格平移不变性破缺的自旋佩尔斯型。我们对磁化强度和二聚化序参量的计算表明不存在中间自旋液体相。
