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arXiv 2008.13446cond-mat.str-elhep-th
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易平面Chern-Simons二维反铁磁体的非限制临界性和玻色化对偶性

Deconfined criticality and bosonization duality in easy-plane Chern-Simons two-dimensional antiferromagnets

Vira Shyta, Jeroen van den Brink, Flavio S. Nogueira

摘要:

具有竞争阶数的二维量子系统可以具有非限定量子临界点,产生与朗道-金兹伯格-威尔逊方案不相容的连续相变,而是预测一阶相变。这是由于LGW序参量在临界点分裂成新的元激发引起的。非限定量子临界性的典型候选者是具有竞争磁序的量子反铁磁体,由易平面CP $^1$模型捕获。然而,一个微妙的问题是,数值表明易平面CP $^1$反铁磁体表现出一阶跃迁。在这里,我们表明,一个额外的拓扑Chern-Simons长期的行动完全改变了这幅图片在几个方面。我们发现拓扑易平面反铁磁体经历了临界指数量子化的二级跃迁。此外,粒子-涡旋对偶性自然地将陈-西蒙斯易平面反铁磁体的配分函数映射为无质量狄拉克费米子。

英文摘要:

Two-dimensional quantum systems with competing orders can feature a deconfined quantum critical point, yielding a continuous phase transition that is incompatible with the Landau-Ginzburg-Wilson scenario, predicting instead a first-order phase transition. This is caused by the LGW order parameter breaking up into new elementary excitations at the critical point. Canonical candidates for deconfined quantum criticality are quantum antiferromagnets with competing magnetic orders, captured by the easy-plane CP$^1$ model. A delicate issue however is that numerics indicates the easy-plane CP$^1$ antiferromagnet to exhibit a first-order transition. Here we show that an additional topological Chern-Simons term in the action changes this picture completely in several ways. We find that the topological easy-plane antiferromagnet undergoes a second-order transition with quantized critical exponents. Further, a particle-vortex duality naturally maps the partition function of the Chern-Simons easy-plane antiferromagnet into one of massless Dirac fermions.

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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