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Electron correlations in Mn(x)Ga(1–x)As as seen by resonant electron spectroscopy and dynamical mean field theory

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Author

  • I. Di Marco
  • P. Thunström
  • M. I. Katsnelson
  • Janusz Sadowski
  • K. Karlsson
  • S. Lebegue
  • Janusz Kanski
  • Olle Eriksson

Summary, in English

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.

Department/s

Publishing year

2013

Language

English

Pages

6-2645

Publication/Series

Nature Communications

Volume

4

Document type

Journal article

Publisher

Nature Publishing Group

Topic

  • Physical Sciences
  • Natural Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 2041-1723