title: Resonant mechanisms of inelastic light scattering by low-dimensional electron gases.
abstract: The contribution of elementary excitations in low-dimensional electron gases to resonant inelastic light scattering is found to be determined by interband transitions involving states at specific wave vectors. In modulation-doped GaAs/GaAlAs quantum wells, we detect only the single-particle excitations (SPE) at resonances with electron-hole transitions at the Fermi wave vector, and only plasmons at resonances with zone-center excitons. The plasmon cross section is comparable to the SPE when double electronic resonance is achieved by tuning the plasmon energy to a valence subband separation.
authors.affiliation: CDP, CNET-CNRS, 196 Avenue Henri Ravera, BP 107, 92225 Bagneux Cedex, France.
authors.forename: B
authors.initials: B
authors.lastname: Jusserand
authors.forename: M N
authors.initials: MN
authors.lastname: Vijayaraghavan
authors.forename: F
authors.initials: F
authors.lastname: Laruelle
authors.forename: A
authors.initials: A
authors.lastname: Cavanna
authors.forename: B
authors.initials: B
authors.lastname: Etienne