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arXiv 1003.1932cond-mat.stat-mechhep-thmath-phmath.MPnlin.SI
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Temperley-Lieb型量子自旋链:周期边界条件、谱重数和有限温度

Quantum spin chains of Temperley-Lieb type: periodic boundary conditions, spectral multiplicities and finite temperature

Britta Aufgebauer, Andreas Kluemper

摘要:

利用Temperley-Lieb等价的概念,以S=1/2XXZ链为参考系,确定了一类Temperley-Lieb型量子自旋链的能谱.我们考虑开边界条件,特别是周期性边界条件。对于这两种类型的边界的识别与XXZ光谱内进行同构表示的基础Temperley-Lieb代数。对于开边界,这些模型的谱与相关XXZ链的谱的不同之处仅在于特征值的多重性。周期性的情况是相当不同的。在这里,我们展示了如何从全局扭曲XXZ链的光谱中获得扇形光谱。作为一个分拆,我们得到了一个紧凑的公式的动量算符本征值的简并。我们的代表性的理论结果允许通过建立一个TL-等价在有限温度和有限领域的热力学研究。

英文摘要:

We determine the spectra of a class of quantum spin chains of Temperley-Lieb type by utilizing the concept of Temperley-Lieb equivalence with the S=1/2 XXZ chain as a reference system. We consider open boundary conditions and in particular periodic boundary conditions. For both types of boundaries the identification with XXZ spectra is performed within isomorphic representations of the underlying Temperley-Lieb algebra. For open boundaries the spectra of these models differ from the spectrum of the associated XXZ chain only in the multiplicities of the eigenvalues. The periodic case is rather different. Here we show how the spectrum is obtained sector-wise from the spectra of globally twisted XXZ chains. As a spin-off, we obtain a compact formula for the degeneracy of the momentum operator eigenvalues. Our representation theoretical results allow for the study of the thermodynamics by establishing a TL-equivalence at finite temperature and finite field.

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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