Single and double photoemission and generalizations

Progress in Non-equilibrium Green's Functions

Pavlyukh, Yaroslav^1

Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Halle

06120, Germany^1

关键词: Density response function;    Electron photoemission;    Fermi golden rule;    Higher-order process;    Non-equilibrium Green's function;    Scattering theory;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/696/1/012005/pdf
DOI  :  10.1088/1742-6596/696/1/012005

来源: IOP

【 摘 要 】

A unified diagrammatic treatment of single and double electron photoemission currents is presented. The irreducible lesser density-density response function is the starting point of these derivations. Diagrams for higher order processes in which several electrons are observed in coincidence can likewise be obtained. For physically relevant situations, in which the photoemission cross-section can be written as the Fermi Golden rule, the diagrams from the nonequilibrium Green's function approach can be put in direct correspondence with the diagrams of the scattering theory.