We present an overview of theoretical techniques for describing electron energy loss processes in a reflection geometry. We start from a fundamental representation of the dielectric susceptibility tensor of the semi-infinite crystal, and illustrate how the screening becomes modified by the presence of the surface. A new formalism is also presented which improves upon existing techniques for modeling energy loss, is fully q-dependent, and accounts for nonlocality. The impact of nonlocality, local field effects and other many-body effects is discussed. The theory is supported by some explicit calculations on the GaAs(001)-c(4 x 4) surface. To cite this article: C Hogan et al., C R. Physique 10 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
Hogan, C., Palummo, M., DEL SOLE, R. (2009). Theory of dielectric screening and electron energy loss spectroscopy at surfaces. COMPTES RENDUS PHYSIQUE, 10(6), 560-574 [10.1016/j.crhy.2009.03.015].
Theory of dielectric screening and electron energy loss spectroscopy at surfaces
PALUMMO, MAURIZIA;DEL SOLE, RODOLFO
2009-01-01
Abstract
We present an overview of theoretical techniques for describing electron energy loss processes in a reflection geometry. We start from a fundamental representation of the dielectric susceptibility tensor of the semi-infinite crystal, and illustrate how the screening becomes modified by the presence of the surface. A new formalism is also presented which improves upon existing techniques for modeling energy loss, is fully q-dependent, and accounts for nonlocality. The impact of nonlocality, local field effects and other many-body effects is discussed. The theory is supported by some explicit calculations on the GaAs(001)-c(4 x 4) surface. To cite this article: C Hogan et al., C R. Physique 10 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.Questo articolo è pubblicato sotto una Licenza Licenza Creative Commons
