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本文推演出密度矩阵元拓扑图示的最简约化方法.应用这方法,仅用n+1个拓扑图即可完备表征n阶非线性极化率, 与此同时还给出表达式中每一项的微观通道数.
In this paper, we deduce the most simplistic method of density matrix element topological illustration.Using this method, we can completely characterize n-order nonlinear polarizability with only n + 1 topological graphs, meanwhile, The number of microscopic channels.