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arXiv 1011.0874cond-mat.str-el
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三角形反铁磁谱的玻色子自旋理论检验

A test of the bosonic spinon theory for the triangular antiferromagnet spectrum

A. Mezio, C. N. Sposetti, L. O. Manuel, A. E. Trumper

摘要:

利用平均场Schwinger玻色子理论计算了自旋为1/2的三角海森堡模型的动力学结构因子。我们发现,重建的色散,从一个非平凡的重新分配的频谱重量,同意与最近发现的自旋激发谱与级数展开。特别是,我们恢复了强重整化相对于线性自旋波理论随着外观的Roton样极小。此外,在类旋子极小值附近,两个自旋连续统对静态结构因子的贡献约占总重量的40%。通过计算密度-密度动力学结构因子,我们在平均场水平上识别出了Schwinger玻色子局域约束松弛的自旋激发谱的非物理弱信号.基于对静态和动态基态性质的精确描述,我们认为玻色自旋子理论应该被认真考虑作为解释三角海森堡模型物理的有效替代。

英文摘要:

We compute the dynamical structure factor of the spin-1/2 triangular Heisenberg model using the mean field Schwinger boson theory. We find that a reconstructed dispersion, resulting from a non trivial redistribution of the spectral weight, agrees quite well with the spin excitation spectrum recently found with series expansions. In particular, we recover the strong renormalization with respect to linear spin wave theory along with the appearance of roton-like minima. Furthermore, near the roton-like minima the contribution of the two spinon continuum to the static structure factor is about 40 % of the total weight. By computing the density-density dynamical structure factor, we identify an unphysical weak signal of the spin excitation spectrum with the relaxation of the local constraint of the Schwinger bosons at the mean field level. Based on the accurate description obtained for the static and dynamic ground state properties, we argue that the bosonic spinon theory should be considered seriously as a valid alternative to interpret the physics of the triangular Heisenberg model.

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