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Derivation of Line Shape Function in the Optical Conductivity by a New Diagram Method

机译:用新图解法求导光导率中的线形函数

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A new diagram method for the line shape function in the optical conductivity formula is introduced and the result obtainedapplying the method to an electron-phonon system is compared with that derived using the projection-reduction method. The result satisfies the population criterion, which states that the distribution functions for electrons and phonons should be combined in multiplicative forms and gives physical intuition to quantum dynamics of electrons in a solid. This method can be called the “KC diagram” method because it originates from the proper application of the Kang-Choi reduction identity and a state-dependent projection operator.
机译:介绍了一种用于光导率公式中线形函数的新图解法,并将该方法应用于电子-声子系统的结果与使用投影还原法得出的结果进行了比较。结果满足总体准则,该准则规定,电子和声子的分布函数应以乘法形式组合,并为固体中电子的量子动力学提供物理直觉。这种方法可以称为“ KC图”方法,因为它源于Kang-Choi归约恒等式和依赖状态的投影算子的正确应用。

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