Home_IJB

Partenaires

Site web CNRS
Université de Lorraine





Rechercher

Sur ce site

Sur le Web du CNRS


Institut Jean Barriol
Université de Lorraine
Faculté des Sciences et Technologies
Boulevard des Aiguillettes
BP 70239
54506 Vandoeuvre-lès-Nancy
France


Accueil du site > À noter

Article dans Nature Communications

Sébastien Lebègue, du laboratoire CRM2, vient de publier un travail sur le ferromagnétisme dans les semi-conducteurs dilués magnétiques (DMS), concrètement dans l'arséniure de Gallium dopé en manganèse, dans Nature Communications.

Référence

Electron correlations in MnxGa1–xAs as seen by resonant electron spectroscopy and dynamical mean field theory
I. Di Marco, P. Thunström, M.I. Katsnelson, J. Sadowski, K. Karlsson, S. Lebègue, J. Kanski and O. Eriksson

Nature Communications, 4, Article number: 2645 (2013)
doi:10.1038/ncomms3645

Résumé de l'article

After two decades since the discovery of ferromagnetism in manganese-doped gallium arsenide, its origin is still debated, and many doubts are related to the electronic structure. Here we report an experimental and theoretical study of the valence electron spectrum of manganese-doped gallium arsenide. The experimental data are obtained through the differences between off- and on-resonance photo emission data. The theoretical spectrum is calculated by means of a combination of density-functional theory in the local density approximation and dynamical mean field theory, using exact diagonalization as impurity solver. Theory is found to accurately reproduce measured data and illustrates the importance of correlation effects. Our results demonstrate that the manganese states extend over a broad range of energy, including the top of the valence band, and that no impurity band splits-off from the valence band edge, whereas the induced holes seem located primarily
around the manganese impurity.