Many Body Effects in Homogeneous Quasi 2D Electron-Hole Plasma in Undoped and Modulation Doped INGaAs Single Quantum Wells

During the past few years a number of studies have addressed the properties of an electron-hole plasma (EHP) in three-dimensional (3D) and two-dimensional (2D) semiconductor structures. The many body effects in the dense quasi-2D electron-hole (e-h) system were discussed in(1–6). Interparticle interactions in a dense e-h system in a semiconductor lead to a renormalization both of the band gap and of the electron and hole dispersion laws. In many-particle theory, these changes are described by a self-energy Σ, which depends on the energy e and quasi momentum k of the quasi particles(7,8). ReΣ describes the renormalization of the dispersion laws for noninteracting electrons and holes.