Raman scattering by coupled layer plasmons and in-plane two-dimensional single-particle excitations in multi-quantum-well structures
Abstract
Raman measurements are reported of collective modes (plasmons) and single-particle excitations in modulation-doped GaAs/AlxGa1-xAs quantum-well systems as a function of the wave-vector component k 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 ħk vF2D characteristic for the response of a 2D electron gas.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 1986
- DOI:
- 10.1103/PhysRevLett.56.2517
- Bibcode:
- 1986PhRvL..56.2517F
- Keywords:
-
- Aluminum Gallium Arsenides;
- Electron Gas;
- Elementary Excitations;
- Plasmons;
- Quantum Wells;
- Raman Spectra;
- Cross Polarization;
- Eigenvectors;
- Gallium Arsenides;
- Hall Effect;
- Landau Damping;
- Solid-State Physics;
- 78.30.Gt;
- 71.45.Gm;
- 73.40.Lq;
- Exchange correlation dielectric and magnetic response functions plasmons;
- Other semiconductor-to-semiconductor contacts p-n junctions and heterojunctions