Abstract
Raman measurements are reported of collective modes (plasmons) and single-particle excitations in modulation-doped quantum-well systems as a function of the wave-vector component parallel to the electron layers. Samples with five layers show discrete layer-plasmon modes manifesting the coupling of the electrons in different layers by Coulomb interaction. The Raman spectra due to single-particle excitations are narrow bands peaking at characteristic for the response of a 2D electron gas.
- Received 18 September 1985
DOI:https://doi.org/10.1103/PhysRevLett.56.2517
©1986 American Physical Society