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arXiv 0907.4164cond-mat.str-elcond-mat.mtrl-sci
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Kagome反铁磁体的低能激发和自旋能隙问题

Low energy excitations of the kagome antiferromagnet and the spin gap issue

Philippe Sindzingre, Claire Lhuillier

摘要:

本文报道了SU(2)不变量模型在各种格点(正方形、三角形、六角形、棋盘格和kagome格点)上精确对角化的最新结果。我们关注每个S扇区的低位水平。展示了无隙系统和有隙系统在行为上的差异。本文讨论了海森堡模型中无带隙自旋液体在kagome晶格上的可扩散性。给出了这种假设下自旋极化率的粗略估计,在小扰动作用下S通道内谱的演化与量子临界点的接近是一致的。我们强调,在精确的光谱中观察到的非常小的S内通道能量尺度是一个非常有趣的信息,以了解该模型的低T动力学。

英文摘要:

In this paper we report the latest results of exact diagonalizations of SU(2) invariant models on various lattices (square, triangular, hexagonal, checkerboard and kagome lattices). We focus on the low lying levels in each S sector. The differences in behavior between gapless systems and gapped ones are exhibited. The plausibility of a gapless spin liquid in the Heisenberg model on the kagome lattice is discussed. A rough estimate of the spin susceptibility in such an hypothesis is given.The evolution of the intra-S channel spectra under the effect of a small perturbation is consistent with the proximity of a quantum critical point. We emphasize that the very small intra-S channel energy scale observed in exact spectra is a very interesting information to understand the low T dynamics of this model.

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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