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We employ Faraday and Kerr effect spectroscopy in the infrared range toinvestigate the electronic structure of Ga1-xMnxAs near the Fermi energy. Theband structure of this archetypical dilute-moment ferromagnetic semiconductorhas been a matter of controversy, fueled partly by previous measurements of theunpolarized infrared absorption and their phenomenological impurity-bandinterpretation. The infrared magneto-optical effects we study arise directlyfrom the spin-splitting of the carrier bands and their chiral asymmetry due tospin-orbit coupling. Unlike the unpolarized absorption, they are intimatelyrelated to ferromagnetism and their interpretation is much more microscopicallyconstrained in terms of the orbital character of the relevant band states. Weshow that the conventional theory of the disordered valence band with dominantAs p-orbital character and coupled by kinetic-exchange to Mn local momentsaccounts semi-quantitatively for the overall characteristics of the measuredinfrared magneto-optical spectra.

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