Excitons and Electron‐Hole Plasma. A Ground State Calculation

Abstract

Abstract For calculating the energy per pair ℰ o in a highly excited semiconductor a Green's function theory is presented which covers the whole density range from the exciton limit to the electron‐hole plasma at high densities. Extensive use is made of the analogy to the excitonic phase theory which is extended here to include correlation and dynamical screening. In a model with equal‐mass parabolic bands a rather shallow minimum of E, somewhat below the exciton energy is found at the density r s = 3.