POTENTIAL BARRIER HEIGHT EFFECTS ON THE INTRASUBBAND AND INTERSUBBANDQUASI-ONE-DIMENSIONAL PLASMONS

The effects of the potential barrier height on the collective excitati ons of a electron gas confined in a GaAs-AlxGa1-xAs quantum wire of re ctangular cross-section are investigated theoretically. For several po tential barrier heights, we calculated the plasmon energy, structure f actor and pair-correlation function, within the Random-Phase Approxima tion regime, considering a three-subband model with only the lowest su bband populated by electrons. We verified that the intersubband plasmo n is more sensitive to the potential barrier height variation than the intrasubband plasmon. We also observed that the confining potential e ffect decreases with the increasing of the wire-width.