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arXiv 1002.2066cond-mat.str-elcond-mat.otherquant-ph
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XY和二聚化模型之间的等效性

Equivalence between XY and dimerized models

Lorenzo Campos Venuti, Marco Roncaglia

摘要:

在平面上具有XY各向异性耦合的自旋1/2链和XX各向同性二聚链在体相中是等效的。对于有限系统,我们证明了等价是精确的在给定的奇偶扇区,照顾后的精确边界条件。证明是建设性的,通过寻找映射到彼此的模型的酉变换。此外,我们大大推广了我们的映射,并表明,即使在完全现场依赖耦合的XY链可以映射到XX模型。这一结果在无序系统的研究中具有潜在的应用价值。

英文摘要:

The spin-1/2 chain with XY anisotropic coupling in the plane and the XX isotropic dimerized chain are shown to be equivalent in the bulk. For finite systems we prove that the equivalence is exact in given parity sectors, after taking care of the precise boundary conditions. The proof is given constructively by finding unitary transformations that map the models onto each other. Moreover, we considerably generalized our mapping and showed that even in case of fully site dependent couplings the XY chain can be mapped onto an XX model. This result has potential application in the study of disordered systems.

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