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arXiv 1401.7654quant-phcond-mat.stat-mechcond-mat.str-elhep-th
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有限纠缠标度的共形数据

Conformal Data from Finite Entanglement Scaling

Vid Stojevic, Jutho Haegeman, I. P. McCulloch, L. Tagliacozzo, Frank Verstraete

摘要:

本文将热力学极限下的平移不变(连续)矩阵乘积态的形式化应用于$(1+1)$维临界模型。有限的键维数限制了纠缠熵,并引入了一个有效的有限关联长度,使状态被扰动远离临界状态。这种微扰的标度假设成立的假设在文献中被称为有限纠缠标度。我们提供了进一步的证据,有限纠缠标度的有效性,并在此基础上制定一个标度算法来估计的中心荷和共形不变的场论的临界指数描述的关键模型正在调查。该算法被应用到三个示例性的模型; cMPS版本的非相对论性Lieb-Liniger模型和相对论性无质量玻色子,和MPS版本的一维量子伊辛模型在临界点。我们的方法的另一个新的方面是,我们直接使用(c)MPS诱导的相关长度,而不是键的尺寸作为标度参数。这一选择的动机是几个理论论据,以及我们的结果的显着准确性。

英文摘要:

In this paper we apply the formalism of translation invariant (continuous) matrix product states in the thermodynamic limit to $(1+1)$ dimensional critical models. Finite bond dimension bounds the entanglement entropy and introduces an effective finite correlation length, so that the state is perturbed away from criticality. The assumption that the scaling hypothesis holds for this kind of perturbation is known in the literature as finite entanglement scaling. We provide further evidence for the validity of finite entanglement scaling and based on this formulate a scaling algorithm to estimate the central charge and critical exponents of the conformally invariant field theories describing the critical models under investigation. The algorithm is applied to three exemplary models; the cMPS version to the non-relativistic Lieb-Liniger model and the relativistic massless boson, and MPS version to the one-dimensional quantum Ising model at the critical point. Another new aspect to our approach is that we directly use the (c)MPS induced correlation length rather than the bond dimension as scaling parameter. This choice is motivated by several theoretical arguments as well as by the remarkable accuracy of our results.

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