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arXiv 1907.04576cond-mat.stat-mechquant-ph
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经典XY模型的Kosterlitz-numerless跃迁的张量网络逼近

Approaching the Kosterlitz-Thouless transition for the classical XY model with tensor networks

Laurens Vanderstraeten, Bram Vanhecke, Andreas M. Laeuchli, Frank Verstraete

摘要:

本文应用变分张量网络方法模拟了经典二维XY模型中的Kosterlitz-无相变相变。特别地,使用具有非阿贝尔O(2)对称性的均匀矩阵乘积态(MPS),我们计算了临界点处自旋刚度的普遍下降。在临界低温区,我们着重研究了MPS纠缠谱来表征Luttinger液相。在高温阶段,我们证实了关联长度的指数发散性,并高精度地估计了临界温度。我们的MPS方法可用于研究具有连续对称性的一般二维相变。

英文摘要:

We apply variational tensor-network methods for simulating the Kosterlitz-Thouless phase transition in the classical two-dimensional XY model. In particular, using uniform matrix product states (MPS) with non-abelian O(2) symmetry, we compute the universal drop in the spin stiffness at the critical point. In the critical low-temperature regime, we focus on the MPS entanglement spectrum to characterize the Luttinger-liquid phase. In the high-temperature phase, we confirm the exponential divergence of the correlation length and estimate the critical temperature with high precision. Our MPS approach can be used to study generic two-dimensional phase transitions with continuous symmetries.

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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