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arXiv 1808.04709hep-thcond-mat.mes-hallcond-mat.str-el
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三维约化QED理论的精确量子标度不变性

On the exact quantum scale invariance of three-dimensional reduced QED theories

D. Dudal, A. J. Mizher, P. Pais

摘要:

在超相对论体系中,采用约化QED方法对石墨烯进行了有效的量子场论描述。伪量子电动力学又称量子电动力学。混合维QED在文献中已经推测,约化QED构成了一类特殊的难以找到的理论的一个例子:在两个维度以上的相互作用的CFT。这种推测是基于双回路微扰理论。在这里,我们给出了这个功能的证明,即精确消失的b函数,从而表明,减少QED可以有效地被认为是一个相互作用的(边界)CFT,在这一领域的基础最近的工作。这个论点对二分量和四分量旋量都有效,也自然地延伸到约化QED的精确边缘变形,从而导致非超对称共形流形。后者对应于两个不同介电半空间之间的边界层费米子。

英文摘要:

An effective quantum field theory description of graphene in the ultra-relativistic regime is given by reduced QED aka. pseudo QED aka. mixed-dimensional QED. It has been speculated in the literature that reduced QED constitutes an example of a specific class of hard-to-find theories: an interacting CFT in more than two dimensions. This speculation was based on two-loop perturbation theory. Here, we give a proof of this feature, namely the exact vanishing of the b-function, thereby showing that reduced QED can effectively be considered as an interacting (boundary) CFT, underpinning recent work in this area. The argument, valid for both two- and four-component spinors, also naturally extends to an exactly marginal deformation of reduced QED, thence resulting in a non-supersymmetric conformal manifold. The latter corresponds to boundary layer fermions between two different dielectric half-spaces.

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