Nonlinear screening in two-dimensional electron gases

Details Nonlinear screening in two-dimensional electron gases Nonlinear screening in two-dimensional electron gases

2002-08-21

arxiv.org/abs/cond-mat/0208409v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.90.046801

We have performed self-consistent calculations of the nonlinear screening of a point charge Z in a two-dimensional electron gas using a density functional theory method. We find that the screened potential for a Z=1 charge supports a bound state even in the high density limit where one might expect perturbation theory to apply. To explain this behaviour, we prove a theorem to show that the results of linear response theory are in fact correct even though bound states exist.

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