Abstract
It is emphasized that the relation between the Laplace-transformed three-current-operator retarded commutator Green's function occurring in quadratic response theory of external photoemission, and the three-current temperature Green's function permits a standard many-body analysis of photoemission. As an example, a diagrammatic particlehole analysis yields generalized golden-rule formulae at finite temperature. Also, conserving approximations can be formally set up quite easily in the framework of the Kadanoff-Baym formalism, yielding quadratic response to the total field inside the specimen, thus limiting the “volume effect”.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have