Electronic structure of ferromagnetic semiconductor Ga1-xMnxAs probed by subgap magneto-optical spectroscopy

G. Acbas; M. H. Kim; M. Cukr; V. Novák; M. A. Scarpulla; O. D. Dubon; T. Jungwirth; Jairo Sinova; J. Cerne

doi:10.1103/PhysRevLett.103.137201

Electronic structure of ferromagnetic semiconductor Ga1-xMnxAs probed by subgap magneto-optical spectroscopy

G. Acbas, M. H. Kim, M. Cukr, V. Novák, M. A. Scarpulla, O. D. Dubon, T. Jungwirth, Jairo Sinova, J. Cerne

Physics

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31 Scopus citations

Abstract

We employ Faraday and Kerr effect spectroscopy in the infrared range to investigate the electronic structure of Ga1-xMnxAs near the Fermi energy. The band structure of this archetypical dilute-moment ferromagnetic semiconductor has been a matter of controversy, fueled partly by previous measurements of the unpolarized infrared absorption and their phenomenological impurity-band interpretation. Unlike the unpolarized absorption, the infrared magneto-optical effects we study are intimately related to ferromagnetism, and their interpretation is much more microscopically constrained in terms of the orbital character of the relevant band states. We show that the conventional theory of the disordered valence band with an antiferromatnetic exchange term accounts semiquantitatively for the overall characteristics of the measured infrared magneto-optical spectra.

Original language	English
Article number	137201
Journal	Physical Review Letters
Volume	103
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.103.137201
State	Published - Sep 24 2009

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title = "Electronic structure of ferromagnetic semiconductor Ga1-xMnxAs probed by subgap magneto-optical spectroscopy",

abstract = "We employ Faraday and Kerr effect spectroscopy in the infrared range to investigate the electronic structure of Ga1-xMnxAs near the Fermi energy. The band structure of this archetypical dilute-moment ferromagnetic semiconductor has been a matter of controversy, fueled partly by previous measurements of the unpolarized infrared absorption and their phenomenological impurity-band interpretation. Unlike the unpolarized absorption, the infrared magneto-optical effects we study are intimately related to ferromagnetism, and their interpretation is much more microscopically constrained in terms of the orbital character of the relevant band states. We show that the conventional theory of the disordered valence band with an antiferromatnetic exchange term accounts semiquantitatively for the overall characteristics of the measured infrared magneto-optical spectra.",

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T1 - Electronic structure of ferromagnetic semiconductor Ga1-xMnxAs probed by subgap magneto-optical spectroscopy

AU - Acbas, G.

AU - Kim, M. H.

AU - Cukr, M.

AU - Novák, V.

AU - Scarpulla, M. A.

AU - Dubon, O. D.

AU - Jungwirth, T.

AU - Sinova, Jairo

AU - Cerne, J.

PY - 2009/9/24

Y1 - 2009/9/24

N2 - We employ Faraday and Kerr effect spectroscopy in the infrared range to investigate the electronic structure of Ga1-xMnxAs near the Fermi energy. The band structure of this archetypical dilute-moment ferromagnetic semiconductor has been a matter of controversy, fueled partly by previous measurements of the unpolarized infrared absorption and their phenomenological impurity-band interpretation. Unlike the unpolarized absorption, the infrared magneto-optical effects we study are intimately related to ferromagnetism, and their interpretation is much more microscopically constrained in terms of the orbital character of the relevant band states. We show that the conventional theory of the disordered valence band with an antiferromatnetic exchange term accounts semiquantitatively for the overall characteristics of the measured infrared magneto-optical spectra.

AB - We employ Faraday and Kerr effect spectroscopy in the infrared range to investigate the electronic structure of Ga1-xMnxAs near the Fermi energy. The band structure of this archetypical dilute-moment ferromagnetic semiconductor has been a matter of controversy, fueled partly by previous measurements of the unpolarized infrared absorption and their phenomenological impurity-band interpretation. Unlike the unpolarized absorption, the infrared magneto-optical effects we study are intimately related to ferromagnetism, and their interpretation is much more microscopically constrained in terms of the orbital character of the relevant band states. We show that the conventional theory of the disordered valence band with an antiferromatnetic exchange term accounts semiquantitatively for the overall characteristics of the measured infrared magneto-optical spectra.

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DO - 10.1103/PhysRevLett.103.137201

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Electronic structure of ferromagnetic semiconductor Ga1-xMnxAs probed by subgap magneto-optical spectroscopy

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