Abstract
For systems governed by two kinds of interactions it is shown that these can be built successively into the Green's functions describing the system's response. Whereas for the ordinary Green's function the Dyson equation to solve has the same form in each step, we derive the non-trivial second-step equation for the transfer or coupling function, which on the one hand is closely related to the self-energy and on the other hand of practical relevance in transport calculations.
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