Far-Infrared Investigations of Magneto-Plasma Resonances of Electron-Hole Drops in Germanium

  • Yamanaka Mitsugu
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Muro Kiyofumi
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Narita Shin-ichiro
    Department of Material Physics, Faculty of Engineering Science, Osaka University

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  • Far Infrared Investigations of Magneto

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Far-infrared magneto-plasma absorptions due to electron-hole drops (EHD) in pure germanium have been measured at quasi-continuous wavelengths from 250 μm to 1730 μm by the use of optically pumped lasers in the Faraday and Voigt configurations up to 80 kOe. The observed magneto-plasma resonances of EHD are classified into the transverse and the longitudial modes, and also into the electric-dipole and the magnetic-dipole resonance modes according to the theory by Ford et al. We also discuss carrier mass renormalization in EHD and influence of strong magnetic field on the properties of EHD, comparing the experimental results with the theoretical calculations. The estimated value of carrier density and radius of EHD are 8×101.7 cm−3 and 0.2 μm at 70 kOe, respectively.

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