Abstract
Stimulated recombination radiation (SSR) from n- and p-type InAs was measured in magnetic fields up to 6.5T. The samples had carried concentrations around 2*016 cm-3 and were immersed in liquid helium at T=1.6K. To excite the samples as homogeneously as possible the authors used two-photon absorption of the radiation of a Q-switched CO laser. They observed band-to-band recombination in all n and p samples. Only in long n-type samples were the observed photon energies better described by donor-valence-band transitions. They found that the frequency of SR in a magnetic field can be best explained if one assumes that the recombination of the electron-hole pairs occurs between levels at the maximum of the density of occupied states in the conduction band and excited holes in the n-type sample, and vice versa in p-InAs.
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