Dimensionality dependence of the band-gap renormalization in two- and three-dimensional electron-hole plasmas in GaAs

G. Tränkle; H. Leier; A. Forchel; H. Haug; C. Ell; G. Weimann

doi:10.1103/PhysRevLett.58.419

Dimensionality dependence of the band-gap renormalization in two- and three-dimensional electron-hole plasmas in GaAs

G. Tränkle, H. Leier, A. Forchel, H. Haug, C. Ell, and G. Weimann

Phys. Rev. Lett. 58, 419 – Published 26 January 1987

Abstract

We have investigated the band-gap renormalization due to many-body effects in electron-hole plasmas in 2D GaAS-GaAlAs multiple quantum-well structures. A comparison of these data with corresponding 3D data and calculations for both dimensionalities shows that the band-gap shift increases absolutely but decreases in effective Rydberg units with decreasing dimensionality. The dimensionality dependence of the band-gap shift is traced to different screening efficiencies in 3D and 2D systems.