Abstract
We present a variational scheme for calculating the irreducible polarizability of an electron system and apply this method to the exchange interaction in a single quantum well. The collective spin-density and intersubband plasmon energies are derived and evaluated numerically in an infinite-square-well approximation. These results are compared with experiments as well as with the previous theoretical results based upon the local-density approximation.
- Received 19 November 1990
DOI:https://doi.org/10.1103/PhysRevB.43.12406
©1991 American Physical Society