Abstract
Recent experiments have revealed the possibility to optically orient both electron and hole spins in bulk germanium. Here we discuss the wavelength dependence of this spin injection process using time-resolved Faraday rotation. Significant hole spin polarization is found only when addressing indirect optical transitions. In contrast, electron spins can be oriented via both direct and indirect optical transitions and even with excess energies much larger than the spin-orbit coupling energy. For photon energies very close to the indirect bandgap, we find indications that the degree of electron spin polarization is significantly enhanced - a trend in line with theoretical predictions.
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