Spin Polarization Dependent Far Infrared Absorption in Ga<sub>1-x</sub>Mn<sub>x</sub>As

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  • Nagai Yasuyuki
    Department of Physics, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
  • Kunimoto Takashi
    Department of Physics, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
  • Nagasaka Keigo
    Department of Physics, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
  • Nojiri Hiroyuki
    Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
  • Motokawa Mitsuhiro
    Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
  • Matsukura Fumihiro
    Laboratory for Electronic Intelligent Systems, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
  • Dietl Tomasz
    Institute of Physics and College of Science, Polish Academy of Sciences, al. Lotników 32/46, PL-00-668 Warszawa, Poland
  • Ohno Hideo
    Laboratory for Electronic Intelligent Systems, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan

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  • Spin Polarization Dependent Far Infrared Absorption in Ga1-xMnxAs.

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Infrared and far infrared transmission spectra have been measured for the ferromagnetic Ga1-xMnxAs (x = 0.034 and x = 0.050) between 10 and 12000 cm-1. A broad peak is observed around 1600 cm-1, and this energy is close to the deep acceptor level of Mn impurity in GaAs. A finite featureless absorption, spreading between this peak and the band gap, due to inter valence band transitions is also observed. At the same time, a non-zero absorption is observed in the lowest frequency studied, which points to the absorption by mobile holes related to the metallic DC conductivity. The frequency dependence in this range, which differs markedly from the Drude model, demonstrates a strong influence of electrostatic and magnetic disorder on the optical conductivity. In particular, the existence of a strong coupling between the Mn spins and the holes explains the considerable increase of the far infrared absorption below the ferromagnetic ordering temperature.

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