ausblenden:
Schlagwörter:
2D electron gas; single quantum well; wave vector dispersion; light scattering
Zusammenfassung:
We determined the wave vector dispersion of elementary
excitations of the two-dimensional electron gas (2DEG) like
plasmons and intersubband excitations of the charge (CDE) and
spin density (SDE) by inelastic light scattering using a
grating coupler. The 2DEG forms in a modulation-doped
AlGaAs/GaAs single quantum well sample on top of which we
evaporated a metallic grating. In this way, in backscattering
geometry with incident light perpendicular to the plane of the
2DEG, light can couple to elementary excitations with finite
wave vectors in the range from 10(4) to 10(6) cm(-1). (C) 2002
Elsevier Science B.V. All rights reserved.