Abstract
We have obtained absolute interband absorption spectra from a series of modulation-doped GaAs/As multiple quantum wells covering a wide range of two-dimensional electron densities. The evolution of the threshold line shape from an exciton to a Fermi-edge singularity is quantified. We discuss the influence of the doubly occupied bound state () on the line shape and compare the results with realistic many-body calculations.
- Received 8 April 1996
DOI:https://doi.org/10.1103/PhysRevB.54.R11082
©1996 American Physical Society