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arXiv 2008.04833cond-mat.str-elcond-mat.stat-mechquant-ph
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张量网络中临界U(1)自旋液体与涌现对称性的鲁棒性

Robustness of critical U(1) spin liquids and emergent symmetries in tensor networks

Henrik Dreyer, Laurens Vanderstraeten, Ji-Yao Chen, Ruben Verresen, Norbert Schuch

AI总结:

通过场论与高精度数值模拟,研究了临界RVB自旋液体与U(1)对称张量网络在微扰下的响应,发现掺杂会打开能隙但关联长度极大,并给出对称性重新涌现的PEPS实例。

摘要:

我们研究了临界共振价键(RVB)自旋液体对掺杂长程单态的响应,以及更一般地,U(1)对称张量网络对非对称微扰的响应。使用场论描述,我们发现在RVB中,掺杂构成了一种相关微扰,会立即打开能隙,这与先前的观察相反。我们的分析预测,即使在显著掺杂下仍存在非常大的关联长度,我们使用高精度数值模拟对此进行了验证。这强调了对仔细分析的需求,但也证明了将此类状态用作临界系统变分拟设的合理性。最后,我们给出了一个PEPS的例子,其中非对称微扰并未打开能隙,且U(1)对称性重新涌现。

英文摘要:

We study the response of critical Resonating Valence Bond (RVB) spin liquids to doping with longer-range singlets, and more generally of U(1)-symmetric tensor networks to non-symmetric perturbations. Using a field theory description, we find that in the RVB, doping constitutes a relevant perturbation which immediately opens up a gap, contrary to previous observations. Our analysis predicts a very large correlation length even at significant doping, which we verify using high-accuracy numerical simulations. This emphasizes the need for careful analysis, but also justifies the use of such states as a variational ansatz for critical systems. Finally, we give an example of a PEPS where non-symmetric perturbations do not open up a gap and the U(1) symmetry re-emerges.

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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