Exchange and correlation in the nonhomogeneous electron gas in semiconductor heterojunctions

D. Gammon, B. V. Shanabrook, J. C. Ryan, D. S. Katzer, and M. J. Yang
Phys. Rev. Lett. 68, 1884 – Published 23 March 1992
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Abstract

We present a detailed comparison between experiment and theory of the magnitude of the exchange-correlation Coulomb interaction in the collective intersubband spin-density excitation of the electron gas confined to GaAs/AlGaAs quantum wells. A widely used self-consistent-field theory in which exchange and correlation is incorporated through the local-density approximation is found to underestimate slightly the magnitude of the interaction, while a nonlocal theory involving a variational solution of the Bethe-Salpeter equation for the density-density correlation function compares well with experiment.

  • Received 20 September 1991

DOI:https://doi.org/10.1103/PhysRevLett.68.1884

©1992 American Physical Society

Authors & Affiliations

D. Gammon, B. V. Shanabrook, J. C. Ryan, and D. S. Katzer

  • Naval Research Laboratory, Washington, D.C. 20375

M. J. Yang

  • SFA Inc., Landover, Maryland 20785

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Vol. 68, Iss. 12 — 23 March 1992

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