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arXiv 0809.2816cond-mat.str-el
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CP(N-1)模型中的单极子问题

Monopoles in CP(N-1) model via the state-operator correspondence

Max A. Metlitski, Michael Hermele, T. Senthil, Matthew P. A. Fisher

摘要:

最早提出的超越朗道-金兹伯格-威尔逊范式的相变之一是在正方形晶格上分离反铁磁体和价键固体的量子临界点。这种跃迁的低能描述被认为是由2+1维CP(1)模型给出的--一种耦合到阿贝尔规范场的玻色子自旋理论。规范场的单极缺陷在这种相变的物理过程中起着重要的作用。本文利用共形场论的态-算符对应关系,结合1/N展开,研究了CP(N-1)模型临界不动点处的态-算符对应关系.这种优雅的方法再现了Murthy和Sachdev通过直接计算获得的双标度维数的结果。我们的方法在技术上的简单性使它成为在共形场论中处理非线性算子的首选方法。

英文摘要:

One of the earliest proposed phase transitions beyond the Landau-Ginzburg-Wilson paradigm is the quantum critical point separating an antiferromagnet and a valence-bond-solid on a square lattice. The low energy description of this transition is believed to be given by the 2+1 dimensional CP(1) model -- a theory of bosonic spinons coupled to an abelian gauge field. Monopole defects of the gauge field play a prominent role in the physics of this phase transition. In the present paper, we use the state-operator correspondence of conformal field theory in conjunction with the 1/N expansion to study monopole operators at the critical fixed point of the CP(N-1) model. This elegant method reproduces the result for monopole scaling dimension obtained through a direct calculation by Murthy and Sachdev. The technical simplicity of our approach makes it the method of choice when dealing with monopole operators in a conformal field theory.

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