Multipole edge plasma modes of parabolic quantum wells

Abstract

We study the excitation modes in parabolic quantum wells via an approach based on the invariant-imbedding method in the random-phase approximation. For large values of wave vectors, several higher-multipole edge plasmon modes have been observed for the first time below the intrasubband plasmon in parabolic quantum wells in addition to the normal surface plasmon modes. It is shown that the edge electron density profile has an important effect on the higher-multipole edge plasmon modes.