唯一性方法和石墨烯的光学电导率：多回路计算的强大技术的新应用
The method of uniqueness and the optical conductivity of graphene: new application of a powerful technique for multi-loop calculations
摘要：
我们回顾的唯一性方法，这是一个强大的技术，在高维理论与共形对称的多圈计算。我们使用的方法在动量空间，并表明，它允许一个非常透明的评价两个循环的无质量传播费曼图与非整数指数的中心线。将所得结果应用于红外洛伦兹不变不动点处石墨烯的光学电导率的计算。分析了反条件的影响。与非相对论性的情况下，包括一个简短的比较。
英文摘要：
We review the method of uniqueness which is a powerful technique for multi-loop calculations in higher dimensional theories with conformal symmetry. We use the method in momentum space and show that it allows a very transparent evaluation of a two-loop massless propagator Feynman diagram with a non-integer index on the central line. The result is applied to the computation of the optical conductivity of graphene at the infra-red Lorentz invariant fixed point. The effect of counter-terms is analysed. A brief comparison with the non-relativistic case is included.
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