Universality classes of order parameters composed of many-body bound states
Universality classes of order parameters composed of many-body bound states
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由多体束缚态组成的序参数的普遍性类
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
A. Tsvelik
中科院分区：
文献类型：
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作者：
A. Tsvelik
这篇理论文章讨论了产生特殊有序类型的微观模型，在这种模型中，传导电子与局域自旋结合在一起，产生复合有序参数。结果表明，复合有序与自旋液体的形成有关，自旋液体的带隙激发带有量子数，量子数是电子数的一小部分。这些自旋液体的特殊之处在于，它们的形成必然涉及传导电子和定域电子的自旋自由度。给出了这种自旋液态的详细描述，特别强调了它们在保持李群对称性和平移不变性的情况下对局域微扰的稳健性。
This theoretical paper discusses microscopic models giving rise to special types of order in which conduction electrons are bound together with localized spins to create composite order parameters. It is shown that composite order is related to the formation of a spin liquid with gapped excitations carrying quantum numbers which are a fraction of those of electron. These spin liquids are special in the sense that their formation necessarily involves spin degrees of freedom of both the conduction and the localized electrons. A detailed description of such spin liquid states is presented with a special emphasize on a demonstration of their robustness against local perturbations preserving the Lie group symmetry and the translational invariance.