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arXiv 1504.07044cond-mat.str-elcond-mat.stat-mechquant-ph
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在对称保护簇模型中实现所有$so(N)_1$量子临界性

Realizing all $so(N)_1$ quantum criticalities in symmetry protected cluster models

Ville Lahtinen, Eddy Ardonne

摘要:

我们表明,所有的$so(N)_1$普适类量子临界出现时,一维广义集团模型与伊辛或塞曼项扰动。每个临界点所描述的低能量理论的$N$线性色散费米子,其频谱,我们显示精确匹配的预测由$so(N)_1$共形场论。此外,通过一个明确的建设,我们表明,所有的集群模型是对偶的非局部耦合横向场伊辛链,与$so(N)_1$临界性的普遍性表现为$N$这些链成为关键。这种对偶性还揭示了集群模型的对称性保护来自于潜在的伊辛对称性,它使$so(N)_1$共形场论的主场的局部表示的识别成为可能。对于最简单和实验上最现实的情况,对应于原来的一维集团模型与本地三自旋相互作用,我们的结果表明,$su(2)_2 \simeq so(3)_1$ Wess-Zumino-Witten模型可以出现在一个本地的,几何不变的和Jordan-Wigner可解的自旋1/2模型。

英文摘要:

We show that all $so(N)_1$ universality class quantum criticalities emerge when one-dimensional generalized cluster models are perturbed with Ising or Zeeman terms. Each critical point is described by a low-energy theory of $N$ linearly dispersing fermions, whose spectrum we show to precisely match the prediction by $so(N)_1$ conformal field theory. Furthermore, by an explicit construction we show that all the cluster models are dual to non-locally coupled transverse field Ising chains, with the universality of the $so(N)_1$ criticality manifesting itself as $N$ of these chains becoming critical. This duality also reveals that the symmetry protection of cluster models arises from the underlying Ising symmetries and it enables the identification of local representations for the primary fields of the $so(N)_1$ conformal field theories. For the simplest and experimentally most realistic case that corresponds to the original one-dimensional cluster model with local three-spin interactions, our results show that the $su(2)_2 \simeq so(3)_1$ Wess-Zumino-Witten model can emerge in a local, translationally invariant and Jordan-Wigner solvable spin-1/2 model.

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