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Comment on 'Quantum phase transition in the four-spin exchange antiferromagnet'

机译:关于“四轴交换反铁磁体中的量子相变”的评论

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摘要

In a recent paper [Phys. Rev. B 80, 174403 (2009)] Kotov et al. studied the paramagnetic-to-antiferromagnetic transition in the J-Q model. Their findings were claimed to be in "fairly good agreement" with previous quantum Monte Carlo (QMC) results. In this Comment we show that the above claim is misleading and in reality their phase transition point is not only far from the corresponding QMC value but also lies in a region of parameter space not yet explored in the literature. We also show that their reference dimer state is unstable against formation of a plaquette condensate, which could in part explain the large fluctuations they found.
机译:在最近的一篇论文中[Phys。 Rev. B 80,174403(2009)] Kotov等。在J-Q模型中研究了顺磁性到反磁性的转变。他们的发现据称与先前的量子蒙特卡洛(QMC)结果“相当好”。在此评论中,我们证明了上述主张具有误导性,实际上它们的相变点不仅远离相应的QMC值,而且还处于文献中尚未探讨的参数空间区域。我们还表明,他们的参考二聚体状态对于形成褶皱状冷凝物是不稳定的,这可以部分解释他们发现的巨大波动。

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