Light emission at the E1 and E1+Δ1 gaps in heavily doped p-type Ge and GaAs |
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Authors: | Narcís Mestres Manuel Cardona |
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Institution: | Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-7000 Stuttgart 80, Federal Republic of Germany |
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Abstract: | We report the observation in heavily doped p-type germanium (Nh ≥ 1018cm?3) of two weak light emission bands centered at the energies of the E1 and E1+Δ1 interband gaps (2.22 and 2.42 eV at 80 K). These bands, which are 100% polarized, are found only for excitation with laser frequencies slightly above the gaps. We attribute them to photon scattering by inter-valence-band excitations of the holes associated with the heavy doping. The fact that the emission bands do not shift with the exciting laser frequency is assigned to a strong resonance enhancement of this scattering near the E1 and E1+Δ1 gaps. We have also observed the corresponding light emission at the E1 gap (3.0 eV) in p-type GaAs. |
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