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arXiv 1002.3692cond-mat.str-el
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kagome晶格上哈伯德模型的手征-自旋分离

Chirality-spin separation in the Hubbard model on the kagome lattice

Masafumi Udagawa, Yukitoshi Motome

摘要:

采用集团推广的动力学平均场论和连续时间量子蒙特卡罗方法,研究了半填充kagome晶格上哈伯德模型在强关联金属区的几何阻挫效应.我们发现,电子关联增强自旋手征在矢量和标量通道。手性随温度的降低而增加,并在低温下出现一个峰值,表明在强关联下出现了一个新的能量尺度。峰值温度比局域自旋矩的峰值温度低得多,即手征性和局域自旋矩的特征温度分离得很好。这是一个签名之间的分离自旋和手征自由度的相关金属制度下的几何挫折。

英文摘要:

Effect of geometrical frustration in strongly-correlated metallic region is studied for the Hubbard model on the kagome lattice at half filling by a cluster extension of the dynamical mean-field theory combined with a continuous-time auxiliary-field quantum Monte Carlo method. We find that the electron correlation enhances the spin chirality in both vector and scalar channels. The chirality grows as decreasing temperature and exhibits a peak at a low temperature, indicating a new energy scale under strong correlation. The peak temperature is considerably lower than that for the local spin moment, namely, the characteristic temperatures for the chirality and the local moment are well separated. This is a signature of separation between spin and chiral degrees of freedom in the correlated metallic regime under geometrical frustration.

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