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Anisotropic and inhomogeneous Coulomb screening in the Thomas–Fermi approximation: Application to quantum dot–wetting layer system and Auger relaxation
Author(s) -
Even J.,
Cornet C.,
Doré F.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200642334
Subject(s) - wetting layer , condensed matter physics , quantum dot , relaxation (psychology) , auger , scattering , anisotropy , coulomb , chemistry , wetting , physics , atomic physics , quantum mechanics , thermodynamics , psychology , social psychology , electron
A model for anisotropic and inhomogeneous Coulomb screening due to 2D and 3D carriers, is proposed in the Thomas–Fermi approximation. Analytical expressions for the screened interaction potentials and scattering matrix elements are obtained. This model is applied to the Auger relaxation of carriers in an InAs/InP quantum dot (QD) – wetting layer (WL) system. The influences of the QD morphology and carriers densities on screening and Auger effects are studied. 2D–2D scattering is found to be the most important process, depending especially on QD morphology. A smearing effect is associated to the wetting layer wavefunction extension along the growth axis. The screened potential is similar to a potential screened by 3D carriers. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)