Protecting clean critical points by local disorder correlations
Protecting clean critical points by local disorder correlations
复制标题
通过局部无序相关性保护干净的临界点
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
T. Vojta
中科院分区：
文献类型：
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作者：
J. Hoyos;N. Laflorencie;André P. Vieira;T. Vojta
我们表明，一个广泛的类的量子临界点可以是稳定的局部相关的混乱，即使他们是不稳定的不相关的混乱。虽然这一结果似乎与哈里斯判据相矛盾，但它自然地遵循了相关序参量场论中没有随机质量项的情况。我们说明了量子自旋链模型的显式计算的一般概念。我们发现，弱局部关联无序与非关联无序诱导的无限随机性物理无关。对于较大的无序，我们发现了一条线的临界点与不寻常的属性，如增加的纠缠熵与无序强度。我们还提出了量子磁学和冷原子物理学的背景下的实验实现。
We show that a broad class of quantum critical points can be stable against locally correlated disorder even if they are unstable against uncorrelated disorder. Although this result seemingly contradicts the Harris criterion, it follows naturally from the absence of a random-mass term in the associated order parameter field theory. We illustrate the general concept with explicit calculations for quantum spin-chain models. Instead of the infinite-randomness physics induced by uncorrelated disorder, we find that weak locally correlated disorder is irrelevant. For larger disorder, we find a line of critical points with unusual properties such as an increase of the entanglement entropy with the disorder strength. We also propose experimental realizations in the context of quantum magnetism and cold-atom physics.