title: Bound states in optical absorption of semiconductor quantum wells containing a two-dimensional electron Gas
abstract: The dependence of the optical absorption spectrum of a semiconductor quantum well on two-dimensional electron concentration n(e) is studied using CdTe samples. The trion peak (X-) seen at low n(e) evolves smoothly into the Fermi edge singularity at high n(e). The exciton peak (X) moves off to high energy, weakens, and disappears. The X,X- splitting is linear in n(e) and closely equal to the Fermi energy plus the trion binding energy. For Cd0.998Mn0.002Te quantum wells in a magnetic field, the X,X- splitting reflects unequal Fermi energies for M = +/-1/2 electrons. The data are explained by Hawrylak's theory of the many-body optical response including spin effects.
authors.affiliation: CEA-Grenoble, Departement de Recherche Fondamentale sur la Matiere Condensee, 17 avenue des Martyrs, 38054 Grenoble Cedex 9, France.
authors.initials: V
authors.lastname: Huard
authors.initials: RT
authors.lastname: Cox
authors.initials: K
authors.lastname: Saminadayar
authors.initials: A
authors.lastname: Arnoult
authors.initials: S
authors.lastname: Tatarenko