Generalized Kadanoff-Baym Theory for NonEquilibrium Many—Body Systems in External Fields. An Effective Multi-Band Approach

The Kadanoff-Baym approach (two-time nonequilibrium Greenʹs functions approach) is extended to charged particle systems in external fields. It is shown that its combination with an effecive multi-band picture yields a powerful theoretical and numerical method to describe correlated many-body systems in nonequilibrium.