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arXiv 1005.0787cond-mat.str-elquant-ph
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阻挫自旋链的价键纠缠熵

Valence bond entanglement entropy of frustrated spin chains

Fabien Alet, Ian P. McCulloch, Sylvain Capponi, Matthieu Mambrini

摘要:

我们将最近引入的价键纠缠熵的定义推广到S=1/2自旋系统的任意SU(2)波函数。由于这种纠缠测量的投影方面的重新制定,我们能够计算它与各种数值技术的挫折自旋模型。我们提供了大量的数值数据的一维J1-J2自旋链,我们能够找到量子相变通过使用块大小的缩放熵。我们还系统地与von Neumann纠缠熵的标度进行了比较。最后,我们强调,价键熵的定义取决于选择的bipartition,使受挫的模型,一个“好”的bipartition应选择,例如根据马歇尔标志。

英文摘要:

We extend the definition of the recently introduced valence bond entanglement entropy to arbitrary SU(2) wave functions of S=1/2 spin systems. Thanks to a reformulation of this entanglement measure in terms of a projection, we are able to compute it with various numerical techniques for frustrated spin models. We provide extensive numerical data for the one-dimensional J1-J2 spin chain where we are able to locate the quantum phase transition by using the scaling of this entropy with the block size. We also systematically compare with the scaling of the von Neumann entanglement entropy. We finally underline that the valence-bond entropy definition does depend on the choice of bipartition so that, for frustrated models, a "good" bipartition should be chosen, for instance according to the Marshall sign.

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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