CORRELATED PAIRS AND A MASS-ACTION LAW IN 2-COMPONENT FERMI SYSTEMS - EXCITONS IN AN ELECTRON-HOLE PLASMA

In an electron‐hole (or electron‐proton) plasma the density of either species is calculated from the single particle Green's function including ladder type diagrams. The density can be decomposed into contributions of uncorrelated quasiparticles and particles in correlated pairs, the latter referring to both, bound and scattering states. No discontinuity occurs at the Mott criterion. In the non‐degenerate limit a mass action law is obtained which is illustrated by a simple model calculation. Copyright © 1979 WILEY‐VCH Verlag GmbH & Co. KGaA