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arXiv 1711.04479cond-mat.str-el
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欠掺杂铜氧化物自旋动力学的变分Monte Carlo研究

Variational Monte Carlo study of spin dynamics in underdoped cuprates

Zuo-Dong Yu, Yuan Zhou, Chang-De Gong

摘要:

自旋激发的沙漏状分散是欠掺杂铜酸盐的共同特征。它是定性的解释基于各种有序状态的一些唯象参数的无规相位近似,但它的起源仍然难以捉摸。本文采用变分蒙特卡罗方法对$t$ - $J$模型中的自旋动力学进行了数值研究。这种无参数方法满足模型的无双占据约束,从而提供了一个更好的评价自旋动力学相对于各种平均场试验状态。我们得出结论,沙漏色散的下分支是一个集体模式和上分支的条纹状态比其他候选人更有可能的后果。

英文摘要:

The hour-glass-like dispersion of spin excitations is a common feature of underdoped cuprates. It was qualitatively explained by the random phase approximation based on various ordered states with some phenomenological parameters; however, its origin remains elusive. Here, we present a numerical study of spin dynamics in the $t$-$J$ model using the variational Monte Carlo method. This parameter-free method satisfies the no double-occupancy constraint of the model and thus provides a better evaluation on the spin dynamics with respect to various mean-field trial states. We conclude that the lower branch of the hour-glass dispersion is a collective mode and the upper branch is more likely the consequence of the stripe state than the other candidates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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