RESONANT INELASTIC LIGHT-SCATTERING BY ELECTRONIC EXCITATIONS IN TUNABLE QUANTUM-WIRE STRUCTURES

Resonant inelastic light scattering was used to investigate both charg e density excitations and spin density excitations in shallow etched G aAs/AlGaAs quantum wires. A semi-transparent Schottky gate was evapora ted on top of the samples which allowed a strong tunability of the ele ctron density and the lateral confinement, even under high illuminatio n conditions used for inelastic light scattering. The range of charge density excitations extended from confined plasmons to a plasmon band structure. Both intra- and intersubband single-particle excitations we re observed. The occurrence of a tunable doublet structure in depolari zed plane wave spectra is attributed to spin flip intrasubband single- particle excitations.