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arXiv 2102.02722hep-thcond-mat.str-el
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大- $N_f$极限下的$\mathcal{N}=1$超对称三维QED及其在超石墨烯中的应用

$\mathcal{N}=1$ supersymmetric three-dimensional QED in the large-$N_f$ limit and applications to super-graphene

A. James, S. Metayer, S. Teber

摘要:

我们研究了含$N_f$两分量费米子的$\mathcal{N}=1$超对称三维量子电动力学。由于光子、$\ep$标量和光子传播子的红外软化,理论流到红外深处的相互作用固定点$p_E \ll e^2 N_f/8$,其中$p_E$是欧几里得动量,$e$是电荷。在$1/N_f$展开式的次领先阶,我们发现无量纲有效耦合常数$\overline{\al}$的流动是这样的:$\overline{\al} \ra 8/\big(N_f \,(1+C/N_f)\big) \approx (8/N_f)(1-0.4317/N_f)$其中$C= 2\,(12-π^2)/π^2$ .因此,非平凡IR不动点相对于量子修正是稳定的。通过映射到超级石墨烯的$\mathcal{N}=1$模型,探索和关联该理论的各种属性。特别是,我们推导出的相互作用校正系数的光学电导率的超石墨烯,$C_{\rm sg} = (12-π^2)/(2π) = 0.3391$,这是六倍大于在非超对称的情况下,$C_{\rm g} = (92-9π^2)/(18π) = 0.0561$。

英文摘要:

We study $\mathcal{N}=1$ supersymmetric three-dimensional Quantum Electrodynamics with $N_f$ two-component fermions. Due to the infra-red (IR) softening of the photon, $\ep$-scalar and photino propagators, the theory flows to an interacting fixed point deep in the IR, $p_E \ll e^2 N_f/8$, where $p_E$ is the euclidean momentum and $e$ the electric charge. At next-to-leading order in the $1/N_f$-expansion, we find that the flow of the dimensionless effective coupling constant $\overline{\al}$ is such that: $\overline{\al} \ra 8/\big(N_f \,(1+C/N_f)\big) \approx (8/N_f)(1-0.4317/N_f)$ where $C= 2\,(12-π^2)/π^2$. Hence, the non-trivial IR fixed point is stable with respect to quantum corrections. Various properties of the theory are explored and related via a mapping to the ones of a $\mathcal{N}=1$ model of super-graphene. In particular, we derive the interaction correction coefficient to the optical conductivity of super-graphene, $C_{\rm sg} = (12-π^2)/(2π) = 0.3391$, which is six times larger than in the non-supersymmetric case, $C_{\rm g} = (92-9π^2)/(18π) = 0.0561$.

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