Direct determination of reduced band gap and chemical potential in an electron-hole plasma in high-purity GaAs |
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Authors: | O Hildebrand BO Faltermeier MH Pilkuhn |
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Institution: | Physikalisches Institut, Universität Stuttgart, D-7000 Stuttgart, Federal Republic of Germany |
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Abstract: | We report the first transmission experiments with tunable i.r. Laser light through an electron-hole plasma in high purity GaAs. Negative absorption (gain) is observed at energies below the chemical potential, and positive absorption above. The experimentally determined energetic positions of the reduced band gap and chemical potential are lower than theoretically expected. |
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