Electromagnetic response of lower-dimensional electron systems: Implications of omitting the ground state calculation

The exact electromagnetic response of an electron gas confined by a parabolic potential is compared to those obtained from a complete mean field theory and an incomplete theory which omits the self-consistent ground state calculation. While the results of the complete theory are in agreement with th...

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Bibliographic Details
Published in:Solid state communications 1990-11, Vol.76 (5), p.613-616
Main Authors: Broido, D.A., Bakshi, P., Kempa, K.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Physics
Surface and interface electron states
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Summary:The exact electromagnetic response of an electron gas confined by a parabolic potential is compared to those obtained from a complete mean field theory and an incomplete theory which omits the self-consistent ground state calculation. While the results of the complete theory are in agreement with the exact response, it is demonstrated that the incomplete, yet commonly used treatment can introduce substantial deviations from the exact result. In addition, for systems with roughly parabolic confinement, a simple method for estimating the response is provided.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(90)90100-P