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arXiv 1302.0230cond-mat.str-elquant-ph
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用连续酉变换研究横场伊辛模型中的多粒子光谱性质

Multi-Particle Spectral Properties in the Transverse Field Ising Model by Continuous Unitary Transformations

Benedikt Fauseweh, Götz S. Uhrig

摘要:

在高场极限下,用连续么正变换求解一维横场伊辛模型。由于我们称之为弦算子的相关算子代数的封闭性,达到了很高的精度。封闭性与通过乔丹-维格纳变换将模型映射到非相互作用费米子的可能性有关。但它的证明并没有参考这个映射。通过连续酉变换得到的有效模型用于计算一个、两个和三个基本激励对对角动态结构因子的贡献。三粒子的贡献到目前为止还没有得到解决的分析,除了接近量子临界点。

英文摘要:

The one-dimensional transverse field Ising model is solved by continuous unitary transformations in the high-field limit. A high accuracy is reached due to the closure of the relevant algebra of operators which we call string operators. The closure is related to the possibility to map the model by Jordan-Wigner transformation to non-interacting fermions. But it is proven without referring to this mapping. The effective model derived by the continuous unitary transformations is used to compute the contributions of one, two, and three elementary excitations to the diagonal dynamic structure factors. The three-particle contributions have so far not been addressed analytically, except close to the quantum critical point.

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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