Abstract
We have performed self-consistent calculations of the nonlinear screening of a point charge in a two-dimensional electron gas using a density functional theory method. We find that the screened potential for a charge supports a bound state even in the high-density limit where one might expect perturbation theory to apply. To explain this behavior, we prove a theorem to show that the results of linear response theory are in fact correct even though bound states exist.
- Received 19 August 2002
DOI:https://doi.org/10.1103/PhysRevLett.90.046801
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