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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 2 Issue 2 (1998) pp 249-257
On the origin of surface states in a correlated local-moment film
R. Schiller, W. Müller, W. Nolting (a)
Humboldt-Universität zu Berlin, Lehrstuhl Festkörpertheorie, Invalidenstraße 110, 10115 Berlin, Germany
Received: 22 September 1997 / Revised: 12 December 1997 / Accepted: 15 December 1997
Abstract: The electronic quasiparticle structure of a ferromagnetic local moment film is investigated within the framework of the s-f model. For the special case of a single electron in an otherwise empty energy band being exchange coupled to a fully ordered localised spin system the problem can be solved exactly and, for the spin-$\downarrow$ electron, some marked correlation effects can be found. We extend our model to incorporate the influence of the surface on the electronic structure. Therefore we modify the hopping integrals in the vicinity of the surface. This leads to the existence of surface states, both for the spin-$\uparrow$ and the spin-$\downarrow$ spectral density of states. The interplay between the modification of the hopping integrals and the existence of surface states and correlation effects is discussed in detail.
PACS. 75.70.-i Magnetic films and multilayers - 73.20.At Surface states, band structure, electron density of states - 75.50.Pp Magnetic semiconductors
(a) email: nolting@physik.hu-berlin.de
Online publication: May 5, 1998
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