Many-Electron Green Function
F. Aryasetiawan, Fredrik Nilsson
In this chapter, a summary of the main properties of the many-electron Green function, which is a central quantity in many-electron theory, is given. The physical interpretation of the Green function and its connection to the experiment are described. Hedin's equations as a set of iterative equations determining the self-energy, and hence the Green function, are derived. Linear response theory and the screened interaction underlying the self-energy formalism are elucidated in detail. Finally, we also describe the thermal (Matsubara) Green function that can be used to describe systems at finite temperatures.
•Aug 3, 2022•0 citations