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arXiv 0809.1323cond-mat.str-el
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二维反铁磁体中的自发三聚化

Spontaneous trimerization in two-dimensional Antiferromagnets

Zi Cai, Shu Chen, Yupeng Wang

摘要:

本文提出了二维反铁磁体中一种新的量子顺磁态:自发三聚体态,它是由自旋三聚体构成的。每个三聚体是由三个相邻的SU(3)对称自旋形成的单重态。研究了kagome晶格中自旋为1的受抑海森堡模型.通过类比分数量子霍尔效应中的赝势方法,我们发现三聚体态为该模型的精确基态提供了一个完美的描述。其他有趣的属性,如本地激发以及磁化平台也进行了研究。结果表明,这种新态将加深我们对二维强关联系统中多体纠缠本质的理解。

英文摘要:

In this paper, we propose a novel quantum paramagnetic state in two-dimensional antiferromagnets: the spontaneously trimer state, which is constructed by the trimers of spins. Each trimer is a singlet state formed by three neighboring spins with SU(3) symmetry. A frustrated spin-1 Heisenberg model in the kagome lattice is investigated. By analogy to the pseudo-potential approach in the fractional quantum Hall effect (FQHE), we find that the trimer state provides a perfect description for the exact ground state of this model. Other interesting properties, such as the local excitations as well as magnetization plateaus have also been investigated. It is shown that this novel state would deepen our understanding of the nature of the many-body entanglement in the two-dimensional strong correlated systems.

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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