Phys. Rev. Lett. 90, 046801 (2003) [4 pages]Nonlinear Screening in Two-Dimensional Electron GasesReceived 19 August 2002; published 28 January 2003 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 behavior, we prove a theorem to show that the results of linear response theory are in fact correct even though bound states exist. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.046801
DOI:
10.1103/PhysRevLett.90.046801
PACS:
73.20.Hb, 71.15.Mb
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